Why are most Hawaiian silverswords found at high altitudes?
What will be an ideal response?
domesticated animals brought by human settlers ate most members of the silversword family. Only isolated plants remained at inaccessible places on the crater walls. These were species that were adapted to higher altitudes. Any of their offspring growing at lower levels are still at risk for being eaten.
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Tay-Sachs disease is a(n) __________ disease that results in blindness, mental retardation, and death
due to __________. a. sex-linked; the absence of one of the sex chromosomes b. autosomal recessive; accumulation of lipids in brain cells c. X-linked; accumulation of lipase in cells of sweat glands d. autosomal; the inability to break down amylase in the intestines e. autosomal dominant; accumulation of mucus in the lung
The brief length of time when mammals and birds learn the appearance of a parent is called:a
imprinting. b. habituation. c. classical conditioning. d. operant conditioning. e. insight learning.
Cellulose is an example of ________
A) a polypeptide B) a steroid C) fiber D) fat
After the drought of 1977, researchers on the island of Daphne Major hypothesized that medium ground finches that had large, deep beaks, survived better than those with smaller beaks because they could more easily crack and eat the tough Tribulus cistoides fruits. If this hypothesis is correct, what would you expect to observe if a population of these medium ground finches colonizes a nearby island where Tribulus cistoides is the most abundant food for the next 1000 years? Assume that (1 ) even the survivors of the 1977 drought sometimes had difficulty cracking the tough T. cistoides fruits and would eat other seeds when offered a choice; and (2 ) food availability is the primary limit on finch fitness on this new island.
A) evolution of yet larger, deeper beaks over time B) evolution of smaller, pointier beaks over time C) random fluctuations in beak size and shape D) no change in beak size and shape