Multiple choice

Tiny plants that float in the ocean are called

  1. Moss

  2. Plankton

  3. Anemone

  4. Metazoa

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Phytoplankton are microscopic marine plants that drift near ocean surfaces and form the base of aquatic food chains. Through photosynthesis, they produce about 50% of Earth's oxygen and support marine ecosystems.