What is the difference between plankton and nekton? Are plankton and nekton natural categories? Fill in the blank(s) with the appropriate word(s)
Plankton include many different photosynthetic and chemosynthetic species that are
responsible for contributing to ocean primary productivity. The word is derived from the
Greek word planktos, which means “wandering.” Plankton drift or swim weakly, going
where the ocean goes, unable to move consistently against waves or current flow. In contrast,
the word nekton (nektos, “swimming”) describes organisms that actively swim. The term
plankton or nekton is not a collective natural category like molluscs or algae, which implies
an ancestral (evolutionary) relationship among the organisms; instead, it describes a common
ecological connection, a lifestyle. Members of the plankton community, also referred to as
plankters, can and do interact with one another. Some can swim weakly. Grazing, predation,
parasitism, and competition occur among members of this dynamic group
You might also like to view...
The Jewish calendar is based on the ________ cycle and must add an extra ________ periodically to keep in step with the agricultural calendar
A) solar, month B) solar, day C) lunar, month D) lunar, year E) agricultural cycle, week
The process whereby streams deepen their channel is known as
A) headwater erosion. B) channel incision. C) stream piracy. D) saltation.
Based on its age-sex diagram, by 2025 Italy will be facing a serious problem with
A. caring for its retirees. B. a new baby boom. C. the huge number of immigrants. D. providing teachers from kindergarten through high school.
What role do receptor sites play in drug activity?
A) The receptor site is the location that a drug binds to, altering the function of a biomolecule. B) The receptor site is the same as the active site in an enzyme. C) The receptor site removes a drug from the blood stream, which limits negative side effects D) The receptor site is unrelated to drug activity. E) none of the above