What word describes a membrane that only allows certain things through it? a)
passive
b)
active
c)
semipermeable
d)
impermeable

How are primary producers important to the alligator's energy supply

Which sets of mrna codons could genetically come for a protein with the following amino acid composition

Which of the following statements is a scientific claim? a. the early solar system had large amounts of water; so, the oldest objects in the solar system should also be abundant in water. b. earth is shaped like a sphere even if not all of the scientific observations related to its shape support this idea. c. the mass of the universe is much greater than current models predict; it is not possible to explain this inconsistency. d. planet earth is abundant in water, but there is no way to scientifically determine from where earth's water originated.