Phytoplankton are only found at the surface of ocean waters because
a. they feed on tiny organisms living at the surface.
b. they are an important food source to surface-dwelling marine organisms.
c. they require sunlight to carry out photosynthesis.
d. they cannot withstand the colder temperatures of deep water.

Why is it important that fibrin is insoluble in water?

What are some possible short and long term medical concerns for crew members on longer space exploration trips

Which plate boundary causes plates to collide forming mountain ranges, volcanoes, and island arcs? give an example of this type of plate boundary. 2. at which plate boundary do rifts and mid-oceans ridges form? give an example of this type of plate boundary. 3. at which plate boundary do plates slide past each other while moving in opposite directions? give an example of this type of boundary.