What are phytoplankton? (Select all that apply.)
A. They are tiny plants that drift with the currents of the ocean.
B. They are microscopic animals that drift with the currents of the wind.
C. They are organisms that support all other life in the oceans.
D. They are small plants and animals that exist both on land and in the ocean.

PLS I NEED ASAP IM TIMED (40 points)