Individuals help sustain biodiversity by _____
a. reducing resource consumption
b. reusing materials
c. recycling materials
d. all of these
D
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The earliest nervous system likely resembled a:
A. nerve cord. B. ganglia. C. simple brain and nerve cord. D. nerve net.
What did Richard Axel and Linda Buck discover about the way in which we are able to perceive many different types of odors?
A. Many different types of odors bind to just a few different types of receptor molecules. B. Vertebrate animals make a large number of distinct types of receptor proteins, each of which binds a particular odorant molecule or small group of such molecules. C. Odors are distinguished by the way in which they bind both olfactory and taste receptors—it is the overall "picture" generated this way that we perceive. D. None of these choices are correct.
The part of the human brain that controls the sleep-wake cycle is called the
A) nucleolus. B) cerebral cortex. C) suprachiasmatic nuclei. D) substantia nigra.
Research indicates that compared to the genomes of bony fish, the elephant shark genome contains ____ the genes
necessary for bone formation.
a. none of b. half of c. most of d. all but one of e. double