The changes in the genetic makeup of a population over time is called _______

A. homologous recombination
B. model organisms studies
C. genetic crosses
D. biological evolution
E. hypothesis testing


D

Biology & Microbiology

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__________ and __________ fluid are the main components of extracellular fluid. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

The ________ are the simplest animals to have an excretory system. (Hint: This system consists of cilia beating within canals.)

Fill in the blank(s) with correct word

Biology & Microbiology

Unlike white blood cells, mature red blood cells lack a(n) ________

Fill in the blank(s) with correct word

Biology & Microbiology

The macromolecule composed of amino acids is a

A. carbohydrate. B. steroid. C. lipid. D. protein. E. nucleic acid.

Biology & Microbiology