Q: What evolutionary process may affect the distribution of a polygenic trait? Choices: - artificial selection - flow selection - characteristic selection - natural selection A:
natural selection

(Question)
Q: What keeps various species from mating and reproducing outside their own species? Choices: - digestive system incompatibility - brain organ incompatibility - cancer organ incompatibility - reproductive organ incompatibility A:
(Answer)
reproductive organ incompatibility

Ques: Q: What is a mutation that changes all or much of a particular chromosome? Choices: - kinetic mutation - biochemical mutation - muscular mutation - chromosomal mutation A:
Ans: chromosomal mutation

(Q).
Q: What proteins synthesized in cells act as catalysts? Choices: - hormones - virophages - byproducts - enzymes A:
(A).
enzymes

Ques:Q: What two forces tend to keep an animal stationary and thus oppose locomotion? Choices: - workload and gravity - thickness and gravity - stength and gravity - friction and gravity A:

Ans:friction and gravity

Q: The medieval catapult has a heavy ballast on one end and what on the other end? Choices: - fragment - pivot - propellant - projectile A:
projectile