Charles Darwin and Alfred Russel Wallace both realized that most species produce many more offspring than is necessary to maintain a constant population. What might be the fate of the excess individuals?
A) They evolve to take advantage of natural resources.
B) The more favorable forms survive and reproduce, but the others do not.
C) They mutate and then are able to adapt to new environments.
Answer: B
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The respiratory pump facilitates the return of blood to the heart by
A) raising the pressure gradient between abdominal and thoracic veins during inspiration. B) decreasing the pressure gradient between abdominal and thoracic veins during inspiration. C) squeezing blood from the rhythmic contraction of the diaphragm muscle. D) decreasing the pressure gradient between abdominal and thoracic veins during expiration. E) raising the pressure gradient between abdominal and thoracic veins during expiration
Cyanobacteria are photortophic. Which of the following would they also be considered?
A. heterotrophic B. autotrophic C. chemotrophic D. obligate anaerobes E. aerobic
Compare and contrast the advantages and disadvantages of gas exchange in terrestrial and aquatic environments. What will be an ideal response?
When a crocodile eats a fish, the interspecific interaction between the two could be expressed as ________ for the crocodile and ________ for the fish
A) ? ; ? B) + ; + C) + ; ? D) ? ; +