Which of the following is not a component of some sponge skeletons?
A. cartilage
B. protein
C. glass-like silica (SiO2)
D. calcium carbonate (CaCO3)
A
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Organisms that require high levels of sodium chloride in order to grow are called ________ organisms.
Fill in the blank(s) with the appropriate word(s).
Which s elhants and crickets have in common?
A. DNA nucleotides form the basis of inherited life, with cells that are formed spontaneously from the environment. B. DNA nucleotides form the basis of all inherited life, with cells that are formed from other cells. C. RNA nucleotides form the basis of all inherited life, with cells that are formed from other cells. D. RNA nucleotides form the basis of inherited life, with cells that are formed spontaneously from the environment.
Soil erosion is caused by ________
a. overgrazing or deforestation only b. all of the choices c. strong winds only d. moving water only
In fish, countercurrent exchange involves water flowing over gills and blood flowing through gill capillaries in opposite directions. This increases gas exchange by creating a(n):
a. larger surface area b. osmotic gradient c. concentration gradient d. reservoir for gas e. source of new hemoglobin