What is the "psychological need" that many humans have for nature?
A) mutualism
B) commensalism
C) community
D) biophilia
D
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Approximately 3.5 million years ago the Isthmus of Panama formed. This new landmass severed the connection between the Pacific Ocean and the Caribbean Sea. An ancestral fish population (porkfish) was split in two by this event; the two populations no longer interbreed and are two distinct species. This type of speciation is called
A. allopatric speciation. B. parapatric speciation. C. hybridization. D. sympatric speciation. E. sexual selection due to ecological variation.
How would you best explain the correlation between an increase in Hox genes and an increase in animal body complexity?
A. Different Hox genes are expressed in different regions of the body. B. Hox genes have duplicated several times during animal evolution, but they are not responsible for an increase in body plan complexity. C. An increase in the number of Hox genes allows for greater specialization in different body regions. D. An increase in the number of Hox genes meant that fewer regulatory genes could be controlled in a species. E. As the number of Hox genes increases, the number of genes encoding proteins for appendage development decreases
Which of the following statements describes an
electron transfer chain? a. It generates energy from carbohydrates. b. Cells use it to dispose of excess electrons. c. It utilizes ATP to synthesize nutrients. d. It transfers energy, stepwise, from one compound to another. e. It requires activation by oxygen.
The small intestines receive
A. pancreatic juices from the pancreas. B. bile from the liver and gall bladder. C. chyme from the stomach. D. All of these are correct. E. None of these are correct.