Explain the relationship between the environment, variation, and selection.
can cause certain traits to be favored through
changing
this can lead to changes in
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How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

What substance acts to prevent sudden ph changes in bodily fluids?

Speed is the ratio of the distance of an object moves to