Ice platforms in the Arctic are a critical resource for the survival of Arctic animals. Seal pups nurse and rest on the ice platforms for the
first six weeks of life. Recent data suggests that warming sea water and
air temperatures will melt 20 percent or more of the Arctic sea ice over
the next 40 years, disrupting the Arctic food web.
Based on the partial Arctic food web,
melting sea ice might lead to a
decrease in the number of -
polar bears
Partial Arctic Food Web
Arctic cod
Polar bear
Killer whale
Arctic birds
Seal
D phytoplankton
Arctic birds
Arctic cod

Maria wanted to grow a fern in her backyard. acting on a suggestion from a friend, she collected brown dots from the underside of a fern's leaves and then potted them. after a few days, maria saw small fern leaves erupting from the pot. which statement explains this phenomenon? a. the fern transitioned from gametophyte generation to sporophyte generation. b. the fern grew as a result of mitosis. c. the fern transitioned from sporophyte generation to gametophyte generation. d. the fern grew to be genetically identical to its parent plant.

Joe is breeding cockroaches in his dorm room. he finds that the average wing length in his population of cockroaches is 4 cm. he chooses the six cockroaches that have the largest wings; the average wing length among these selected cockroaches is 10 cm. joe interbreeds these selected cockroaches. from earlier studies, he knows that the narrow-sense heritability for wing length in his population of cockroaches is 0.6. a. calculate the selection differential and expected response to selection for wing length in these cockroaches. b. what should be the average wing length of the progeny of the selected cockroaches?

Which process is involved in growing crops? irrigation transportation recreation condensation