Which of the following is NOT a negative impact associated with hydroelectric power?
A. Sediments may deposit over time reducing or even stopping the flow of water.
B. River and stream habitats are drastically altered or destroyed.
C. Thermal pollution is released into the water.
D. Carbon dioxide is released into the air.
E. Aquatic biodiversity is reduced.
Ans: D. Carbon dioxide is released into the air.
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If a set of genes is repressed in the presence of the controlling substance, it is referred to as ________ control.
Fill in the blank(s) with the appropriate word(s).
Najash is an extinct fossil species that has distinct functional pelvis and hindlimbs. Choose the best answer which explains this in evolutionary theory.
A. Najash hindlimbs and pelvis bones represent vestigial structures in that species.
B. Najash was an evolutionary dead end, since no other snake species has anything but vestigial structures.
C. Najash shares homologous features with other vertebrates, such as reptiles.
D. Najash is a transitional species, that has not yet lost its pelvis and hindlimbs.
E. Najash is both a transitional species, and shares homologous structures with other vertebrates, such as reptiles.
As John walked outside the ballpark, a foul ball sailed over the fence and came straight at him. He saw it, and before he could think of what to do, he had reflexively jumped out of the way. What part of the brain saved John from a nasty bump?
A) hypothalamus B) pons C) medulla oblongata D) midbrain
In 1964, the Skipper, Gilligan, and their passengers are shipwrecked! Unknown to them, the rest of the world annihilates each other in a nuclear warm and they are the last 17 people on the earth. What evolutionary force would be primarily responsible for the genetic makeup of remaining human 2,000 years later?
A. Natural selection B. Genetic drift C. Gene flow D. Mutation E. Non-random mating