Read the following description Clusters of cells located near the carotid artery in the neck sense the amount of oxygen in the blood. If the
level is too low, these arteries send signals to the brain that result in an increased breathing rate, which
increases the amount of oxygen in the blood

This is an example of which of the following?

O positive feedback helping to maintain homeostasis

O negative feedback to amplify small signals

positive feedback to amplify small signals

O negative feedback helping to maintain homeostasis

Umbilical cord blood is a rich source of stem cells. which possible advance in biology would most likely be a result of performing research with an individual’s banked cord blood? creation of a novel cancer cell line to test anticancer agents creation of a personalized cell replacement therapy for the donor creation of a skin graft for an unrelated burn victim creation of a culture to produce vitamin e

Read the following scenario to answer the following question. over the past 60 years, many amphibian species have experienced significant population declines, and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. when most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that a. the founder effect becomes increasingly important b. microevolution no longer occurs c. gene flow between populations is reduced d. artificial selection becomes a greater factor in microevolution

What enzyme is most important for dna replication and why?