1. Microorganisms are both beneficial and harmful. Which of these microorganisms is needed by plants? a. lactobacilli b. phytoplankton c. nitrogen-fixing bacteria d. virus
Phytoplankton is the base of several aquatic food webs. In a balanced ecosystem, they provide food for a wide range of sea creatures. Phytoplankton, also known as microalgae, are similar to terrestrial plants in that they contain chlorophyll and require sunlight in order to live and grow.
