What is a peptide?
a. a healthy nerve cell
b. a scrap of protein
c. the cause of cancer
d none of above

Which of the following is a cost of urbanization? a-cities can provide a high standard of living. b-cities are hubs of entertainment and education. c-paving over land changes the environment. d-job opportunities are greater in urban centers.

Consider this plant cell which organelle is labeled g

Apopulation of black bears depends on salmon from a stream for food. if a drought causes the stream to run dry one year, how will this likely impact the black bear population?