The urinary system develops primarily from
a. ectoderm.
b. mesoderm.
c. endoderm.
d. the placenta.
e. the gray crescent.
B
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Although selection tends to eliminate deleterious alleles from populations, these mutations often persist because they are frequently created again
The rate at which deleterious alleles are being eliminated by selection is exactly equal to the rate at which new copies are being created by creation is termed ________. [three words] Fill in the blank(s) with correct word
The process of the body using simple substances to build more complex substances is called:
Ribosomes, the site of protein synthesis, are found in what type of cells?
A. Plant and animal cells only B. Animal cells only C. Plant cells only D. All cells
Positive feedback mechanisms enhance changes in the body
Indicate whether the statement is true or false