Which of the following best explains the role of deep sea coral reefs in the environment?
a. they are responsible for fouling fishing lines.
b. they are a quick-growing food source for deep water predators.
c. they provide a critical habitat for many other organisms.
d. they are a record of past climate conditions.

Migration is a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations c. select the best answer from above

Which heredity condition causes a buildup of mucus in lungs and pancreas? a. cystic fibrosis b. heart disease c. huntington's disease d. sickle cell anemia

Which are characteristics of flukes? check all that apply. a they are free living. b they are a type of flatworm. c they reproduce sexually. d they have eyespots. e they are segmented.