Answer the following question given this paragraph: Natural Selection for a Polygenic Trait. Natural selection may affect the distribution of a polygenic trait. These graphs show three ways this can happen. 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)
Answer the following question given this paragraph: Figure 18.19 The shape of the male reproductive organ varies among male damselfly species, and is only compatible with the female of that species. Reproductive organ incompatibility keeps the species reproductively isolated. 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: Answer the following question given this paragraph: A mutation that changes all or a large part of a chromosome is called a chromosomal mutation. This type of mutation tends to be very serious. Sometimes chromosomes are missing or extra copies are present. An example is the mutation that causes Down syndrome. In this case, there is an extra copy of one of the chromosomes. 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).
Answer the following question given this paragraph: Chemical reactions constantly occur inside the cells of living things. However, under the conditions inside cells, most biochemical reactions would occur too slowly to maintain life. That's where enzymes come in. Enzymes are catalysts in living things. Like other catalysts, they speed up chemical reactions. Enzymes are proteins that are synthesized in the cells that need them, based on instructions encoded in the cells' DNA. Q: What proteins synthesized in cells act as catalysts? Choices: - hormones - virophages - byproducts - enzymes A:
(A).
enzymes
Ques:Answer the following question given this paragraph: 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
Answer the following question given this paragraph: Q: The medieval catapult has a heavy ballast on one end and what on the other end? Choices: - fragment - pivot - propellant - projectile A:
projectile