1. A group of early giraffes lives in a lush forest with many trees and shrubs of different heights to feed on. These giraffes have necks of various lengths,
with most giraffes having a medium length neck. Then a blight passed
through the area, killing off all of the low growing plants, leaving only tall
trees whose leaves are far off the ground. Giraffes with shorter necks now
have a hard time getting food, while those with longer necks can feed on the
high growing leaves. After several generations, the giraffes in this area all
have longer necks than those before the blight. What type of selection has
occurred in this giraffe population?

The endoplasmic reticulum (er) is an organelle in some cells. in these cells, it is continuous with the nuclear membrane and forms a large part of the cell\'s total membrane. sort the phrases below as describing rough er, smooth er, both, or neither. note: if you answer any part of this question incorrectly, a single red x will appear indicating that one or more of the phrases are sorted incorrectly.1) found in prokaryites and uekaryotys2) involved in protein synthesis3) involve in lipid synthesis4) contains molecular chaperones in lumen5) bound with ribosomes6) involved in toxin or drug metabolism7) large systemot internnected tubules,vesicles, and sacs8) "packages" enzymes in vesicles for secretion.

What causes darkening of the skin as melanin production increases

Which is an important function of normal flora? a. aid with bone marrow production. b. crowd out pathogenic bacteria. c. destroy digestive track pathogens. d. manufacture iron in the bloodstream.