Which of the following best characterizes natural selection?
inment in which leaves grew only at the tops of short trees, giraff
a. faced with an environment in which leaves grew only at the to
responded by growing long necks.
onment where leaves grew only at the
b. only giraffes with long necks moved into an environment where leaves
tops of short trees.
iraffes that did not eat leaves from the tops of short trees grew shorter
c. the necks of giraffes that did not eat leaves from the tops
lack of exercise.
d. among a population of giraffes, those with long necks were able to survive better i
environment in which leaves grew only at the tops of short trees.

The asian shore crab (hemigrapsus sanguineus) is an invasive species that has impacted the atlantic coast. predict what characteristic of this invader would most likely disrupt the biodiversity of this area.

Awoman whose sister tested positive for a specific mutation in the brca1 gene, which increases the risk for breast and ovarian cancer, is found not to have that mutation but does have a mutation of unknown significance near the known mutation site. how should this woman be counseled? select one: a. she should be informed that her risk for breast cancer is greater than the general population but not as great as her sister’s risk. b. she should be informed that because she does not have the mutation, her risk for breast cancer is not greater than that of the general population. c. she should be informed of her gene mutation status and be presented with all the available prophylaxis options and reconstruction options. d. she should be informed that she does not have the specific mutation but that because another mutation is present she should be vigilant about screening

Aheterozygous normal male marries a woman with a sickle cell anemia. give the genotypes and possible phenotypes of the offspring