An adult brain weighs about
a. one pound.
b. two pounds.
c. three pounds.
d. one half pound.
e. ten pounds.
C
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If the number of chromosomes in an animal's gametes is 20, then a somatic cell from that animal would contain ____
chromosomes.
a. 5 b. 10 c. 20 d. 40 e. 80
In which of the following groups of organisms are most species iteroparous?
A) annual plants B) perennial plants C) periodical cicadas D) salmon
In a population of finches, birds with small, thick beaks can efficiently crack the seeds of one species of plant, while birds with long, thin beaks can efficiently crack the seeds of another plant species. Birds with medium-sized beaks cannot efficiently eat either kind of seed. After many generations, the distribution of beak size in these birds will be _______________ because of ___________________.
a) normal; stabilizing selection b) skewed to the left; directional selection c) skewed to the right; directional selection d) normal; environmental pressures e) "U"-shaped, with peaks at the low and high extremes of beak size; disruptive selection
True or False: Nervous system diseases must always use the respiratory tract as a portal of entry because of its proximity to the brain.
What will be an ideal response?