License Courses. The OAR licensing programs provide a solid foundation to prepare you for the state exam to obtain your Provisional Sales Associate License and Brokerâs License. Sales Associate License. Complete the Pre-License Course and receive your OREC approval to take the provisional sales associate license exam.
Phytoplankton refers to the autotrophic component of the plankton that drifts in the water column. Most phytoplankton are too small to be individually seen with the unaided eye. Phytoplankton, like plants, obtain energy through a process called photosynthesis, and so must live in the well-lit surface layer of an ocean, sea, or lake. Through photosynthesis, phytoplankton (and terrestrial plants) are responsible for much of the oxygen present in the Earth's atmosphere.
plankton - the aggregate of small plant and animal organisms that float or drift in great numbers in fresh or salt water. 1  organism, being - a living thing that has (or can develop) the ability to act or function independently. 2  phytoplankton - photosynthetic or plant constituent of plankton; mainly unicellular algae.