When a desert lizard is on hot sand, nerves in its foot send a message to the brain. The brain analyzes this information and sends a message back through the nerves in the foot. This message tells the foot to move off the hot sand. Once the foot has moved off the hot sand, a message is relayed back to the brain. In this example, what is the first message sent to the brain? A. input
B. output
C. process
D. feedback

This is the amino acid cysteine. circle the amine group, put a box aroundthe carboxylic acid group and use a different colored pencil/pen to circle the sidechain (r group). h o | ||nh2— c- c-oh | ch2 | sh

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?

Why do you suppose the structural polysaccharide cellulose does not contain branches?