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All veins carry blood away from the heart.

Allele frequencies of a population can change by

How many chromosomes belong to a normal human female?

What type of bond holds the DNA strands together?

Stem cells _____.

Staphylococcus aureus is a type of

Nearly all ________ are aquatic

Which are most closely related to humans?

_______ produce _______ whereas _______ produce _______

The biological function of stem cells is to _____