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the suns innermost layer is called **blank**
[ "surface", "solar", "flare" ]
core
A growth spurt requires constant divisions of **blank**
[ "hairs", "seeds", "proteins" ]
cells
Fungi may form mutualistic relationships with plants , algae , cyanobacteria , and **blank**
[ "plants", "farmers", "eggs" ]
animals
Dessication is an extreme and usually fatal form of **blank** in animals
[ "diarrhea", "depletion", "starvation" ]
dehydration
Internal and external forms of **blank** life process occur as simple diffusion due to a partial pressure gradient
[ "reproduction", "metabolism", "photosynthesis" ]
respiration
Soluble minerals and clays accumulate in **blank** soil layer , allowing it to hold more water
[ "silt", "subsurface", "topsoil" ]
subsoil
the common word for potential difference in a circuit is **blank**
[ "watt", "velocity", "frequency" ]
voltage
the stomach of a crocodile have **blank** chambers
[ "six", "ten", "three" ]
two
Although air can transfer heat rapidly by convection , it is a poor conductor and thus a good **blank**
[ "magnet", "absorber", "transporter" ]
insulator
Most plants grow continuously , except for **blank** periods
[ "abnormal", "mutant", "winter" ]
dormant
**blank** are used to observe the earth 's surface
[ "crystals", "telescopes", "sensors" ]
satellites
Carboxylic acids are weak acids , meaning they are not 100 % ionized in **blank**
[ "air", "ethanol", "liquid" ]
water
An endocrine disease usually involves the secretion of too much or not enough of **blank**
[ "enzyme", "metabolite", "sweat" ]
hormone
In experiments with garden peas , austrian monk gregor mendel described the basic patterns of **blank**
[ "behavior", "preference", "color" ]
inheritance
Nutrition and diet affect your metabolism . more energy is required to break down fats and proteins than this ? **blank**
[ "vitamins", "electrolytes", "minerals" ]
carbohydrates
unsaturated hydrocarbons with at least one double bond between carbon atoms are called **blank**
[ "amines", "enzymes", "peptides" ]
alkenes
the opposite of melting is **blank**
[ "evaporation", "liquidation", "compression" ]
freezing
Sexual reproduction involves haploid gametes and produces a diploid zygote through **blank** process
[ "infection", "vivisection", "sedimentation" ]
fertilization
Transform faults are the site of massive **blank**
[ "vibrations", "storms", "tornadoes" ]
earthquakes
In a chemical reaction , the amounts of reactants and products will be constant when **blank** state is attained
[ "saturation", "peak", "homogeneity" ]
equilibrium
**blank** protects a developing flower while it is still a bud
[ "shell", "petals", "lobes" ]
sepals
the term for the force of attraction between things that have a mass is **blank**
[ "weight", "motion", "magnetism" ]
gravity
the long , thin protein extensions in most prokaryotic cells are called **blank**
[ "analyte", "cingulum", "neutrons" ]
flagellum
Dialysis is a treatment for failure of **blank** organs
[ "lungs", "liver", "spleen" ]
kidneys
Renal plasma flow equals the blood flow per minute times the **blank**
[ "erythrocytes", "leukocytes", "hemoglobin" ]
hematocrit
**blank** different types of taste can be detected by taste buds
[ "three", "two", "hundreds" ]
five
Titration is a method to determine **blank** in acids or bases
[ "alkalinity", "maturation", "glucose" ]
concentration
sores in the lining of the stomach or duodenum that are usually caused by bacterial infections or acidity are **blank**
[ "lesions", "clots", "hernia" ]
ulcers
**blank** is made from dna and protein molecules coiled together
[ "bacterium", "enzymes", "atoms" ]
chromosome
The bones of the skull are connected by **blank** type of joints
[ "semi-mobile", "pivoting", "adjustable" ]
immovable
the lowest layer of the atmosphere is **blank**
[ "ionosphere", "chromosphere", "lithosphere" ]
troposphere
Phosphate-containing ocean sediments form primarily from the bodies of ocean organisms and from their **blank**
[ "ancestors", "skeletons", "blood" ]
excretions
The passing of traits from parents to offspring is done through **blank**
[ "sperm", "egg", "blood" ]
dna
In a glass of sweet tea the sugar is known as the solute and the water is known as **blank**
[ "pigment", "solid", "calcium" ]
solvent
Red litmus paper turns **blank** color when placed in a basic solution
[ "white", "orange", "pink" ]
blue
The difference between the theoretical half-reaction reduction potential and the actual voltage required is called **blank**
[ "resistance", "excess", "overcharge" ]
overpotential
all vertebrates reproduce in **blank**
[ "mitosis", "asexually", "biologically" ]
sexually
**blank** is used to describe a collection of molecules surrounded by a phospholipid bilayer that is capable of reproducing itself
[ "atom", "proteins", "organism" ]
cell
By allowing blood levels of a hormone to be regulated within a narrow range , feedback loops contribute to maintaining **blank** state
[ "hypothesis", "hibernation", "consciousness" ]
homeostasis
**blank** are living things that obtain glucose by eating self feeders called
[ "producers", "chimeras", "viruses" ]
heterotrophs
Virtually every task performed by living organisms requires **blank**
[ "solids", "mineral", "metals" ]
energy
Compounds like sodium chloride form structures called **blank**
[ "ions", "microorganisms", "hydrocarbons" ]
crystals
When a series of measurements is precise but not **blank** , the error is usually systematic
[ "velocity", "length", "color" ]
accurate
alloys that are mostly composed of mercury are known as **blank**
[ "halogens", "fillings", "compounds" ]
amalgams
**blank** are made from highly reflective metal that is applied to a curved or flat piece of glass
[ "lenses", "kaleidoscopes", "prisms" ]
mirrors
Surface tension of alveolar fluid , which is mostly water , creates an inward pull of the tissue of **blank** organ
[ "spleen", "brain", "heart" ]
lung
**blank** of tumor mostly does not cause serious problems and can be completely removed by surgery
[ "toxic", "persistent", "malignant" ]
benign
**blank** and protects the soft organs of the body
[ "Skin", "skull", "Muscle" ]
skeleton
the earth ' s main source is of energy **blank**
[ "rivers", "ocean", "moon" ]
sun
**blank** of reproduction only involves one parent
[ "primitive", "organic", "binary" ]
asexual
How metalloids behave in chemical interactions with other elements depends mainly on the number of **blank** , in the outer energy level of their atoms
[ "protons", "positrons", "neutrons" ]
electrons
**blank** shows specialization and adaptation
[ "asymmetry", "beautiful", "compression" ]
segmentation
The spermatids are transported from the testes to **blank**
[ "abdominis", "Duodenum", "vas" ]
epididymis
**blank** makes and stores pigments that give petals and fruit their orange and yellow colors
[ "sporozoans", "protozoa", "pores" ]
chromoplasts
When electrons return to a lower energy level , they emit the excess energy in the form of **blank**
[ "weight", "electricity", "energy" ]
light
another term for nearsightedness is **blank**
[ "hypoxia", "glaucoma", "anemia" ]
myopia
particles take the shape of their container , but can not expand to fill it in **blank**
[ "gas", "mixture", "chemical" ]
liquid
Runoff is likely to cause more **blank** if the land is bare
[ "abrasion", "sediment", "weathering" ]
erosion
Cations have **blank** type of charge
[ "negative", "neutral", "constant" ]
positive
**blank** is subdivided into ascending , descending , transverse and sigmoid parts
[ "heart", "uterus", "lungs" ]
colon
Ammonia , urea , and uric acid are examples of **blank** kind of waste
[ "carbonous", "sulphurous", "oxygenous" ]
nitrogenous
variants of genes are called **blank**
[ "antigens", "mutations", "allergens" ]
alleles
Mushrooms are an example of **blank** type of organism , which includes beneficial and toxic specimens
[ "spores", "bacteria", "seeds" ]
fungi
Comparing **blank** sequences provides clues to evolution and development
[ "DNA", "genes", "organisms" ]
genome
a measure of the average amount of energy of motion , or kinetic energy , a system contains is called **blank**
[ "size", "variation", "precipitation" ]
temperature
Many hydrocarbons are cyclic and adopt specific three-dimensional structures that influence their physical and **blank** properties
[ "liquid", "electrical", "radiation" ]
chemical
Bacteria can be chemotrophs , which obtain **blank** by breaking down chemical compounds in their environment
[ "waste", "chemials", "food" ]
energy
**blank** maintain a unidirectional flow of blood despite the low blood pressure
[ "funnels", "tubes", "pumps" ]
valves
we call the cartilaginous structure that surrounds the notochrod **blank**
[ "osteocytes", "clavicle", "membrane" ]
arcualia
the process of the transfer of pollen from an anther to a stigma in angiosperms is called **blank**
[ "grabation", "evolution", "wind" ]
pollination
Despite its small size , an erythrocyte contains about 250 million molecules of **blank**
[ "calcium", "plasma", "potassium" ]
hemoglobin
**blank** variables are used to describe the condition of a gas
[ "five", "one", "three" ]
four
a suggested explanation for a phenomenon or a suggested explanation for a relationship between many phenomena is called **blank**
[ "query", "system", "process" ]
hypothesis
Land plants are classified into two major groups according to the absence or presence of **blank** tissue
[ "disease", "root", "bacterial" ]
vascular
the name for biochemical compounds that consist of one or more chains of small molecules is called amino acids **blank**
[ "lipids", "protons", "hormones" ]
proteins
the ionic compounds that produce negative hydroxide ions when dissolved in water are **blank**
[ "isotopes", "acids", "enzymes" ]
bases
Triggered by changes in the environment , migration and hibernation occur as cycles on **blank** temporal basis
[ "bi-annually", "seasonally", "monthly" ]
annual
In most animals , **blank** sense is related to balance or equilibrium
[ "vision", "tasting", "feeling" ]
hearing
Terminal pods are located at the end of **blank**
[ "fruits", "leaves", "spines" ]
stems
What forms **blank** the spores from two parents fuse during sexual reproduction
[ "xerophyte", "spirogyra", "monospore" ]
zygospore
the most common seedless vascular plants are **blank**
[ "trees", "grasses", "weeds" ]
ferns
In a monogamous pairing , a male individual is generally paired with **blank** other type of individual in a sexual relationship
[ "worker", "male", "drone" ]
female
**blank** is formed when an oxygen atom picks up a pair of hydrogen ions from a solution
[ "liquid", "turpentine", "ammonia" ]
water
you call a species that has died out in the past **blank**
[ "endangered", "inhabit", "remnant" ]
extinct
the method of setting or correcting a measuring device by matching it to known measurement standards is called **blank**
[ "parallax", "distortion", "precision" ]
calibration
**blank** branch of biology studies animal behavior
[ "microbiology", "anthropology", "embryology" ]
ethology
**blank** of measure is equal to the amount of work a horse can do in 1 minute
[ "joule", "watt", "torque" ]
horsepower
**blank** is characterized by an incomplete digestive system and a single , tentacled opening
[ "annelids", "prokaryotes", "sponges" ]
cnidarians
not the same as energy , but means the energy per unit charge is **blank**
[ "frequency", "speed", "mass" ]
voltage
**blank** is used to propagate other plants
[ "petals", "spores", "roots" ]
leaves
Something that has all of the characteristics of life is considered to be **blank**
[ "molecule", "organism", "ecosystem" ]
alive
living things need **blank** to survive
[ "oxygen", "heat", "molecules" ]
nutrients
The denser regions of the electron cloud are called **blank**
[ "cores", "lattices", "isotopes" ]
orbitals
In studying energy , scientists use **blank** to refer to the matter and its environment involved in energy transfers
[ "molecule", "ecosystem", "world" ]
system
A system in **blank** state can not spontaneously change , and therefore can do no work
[ "equality", "balance", "stability" ]
equilibrium
a species that plays an especially important role in it 's community called is **blank**
[ "complement", "Invasive", "Leader" ]
keystone
The rings of **blank** planet can be easily seen from earth
[ "Venus", "jupiter", "Neptune" ]
saturn
a blue green color is **blank**
[ "Mars", "sirius", "Mercury" ]
uranus
The simplest class of organic compounds is the **blank**
[ "particles", "Phenols", "gas" ]
hydrocarbons
Some meteorites are made of iron and nickel and are thought to be very similar to **blank** part of the earth
[ "crust", "shelf", "mantel" ]
core