Which of hte following would be a position held by someone that believed in the punctuated equilibrium theory?
a. Most evolutionary change occurs during relatively short times of dramatic change or enviromental challenges.
b. There is a continuous slow gradual change from one species to another species
c. One should expect to find many transitional fossils left by organisms in the process of forming a new species
d. Natural selection plays a very minor role in the mechanism of evolution
e. Given nough time, most existing species will gradually evolve into mew species
Answer: a. Most evolutionary change occurs during relatively short times of dramatic change or enviromental challenges.
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Which of the following is NOT a correct statement about food chains?
a. the food-chain concept is helpful in thinking about community interactions, but is probably an oversimplification of the actual interactions b. food webs show the relationships among multiple food chains c. food webs are b better than food chains for showing the position of omnivores within the community d. food chains are often complex and intertwined e. all of the above are correct statements about food chains
The species-time hypothesis suggests communities diversify with age.
Answer the following statement true (T) or false (F)
As energy passes through a food chain, approximately ____ percent is lost as it passes through each trophic level.
A. 10 B. 25 C. 50 D. 90
A phosphate group binds to what molecule to create the "backbone" of the DNA molecule?
A) Adenine B) Deoxyribose C) Ribose D) Other phosphate molecules