Which of the following statements is true?
a. gene flow and natural selection always result in evolution.
b. gene flow usually increases the genetic differences between two populations.
c. according to natural selection, organisms with poor adaptations will never reproduce.
d. since genetic drift is random, it does not always favor the "healthier" or "better" organisms.

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✅ D. Since genetic drift is random, it does not always favor the "healthier" or "better" organisms.

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.