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Lecture 1
    1. The importance of zooplankton in the marine food chain
    2. The interdependence of two types of tiny marine organisms
    3. A physical feature of zooplankton that makes them well adapted for swimming
    4. A phenomenon observed in some species of zooplankton
    1. Diel vertical migration uses up a lot of energy.
    2. Diel vertical migration exposes zooplankton to predators.
    3. Diel vertical migration prevents zooplankton from being able to digest phytoplankton.
    4. Diel vertical migration forces zooplankton populations to live permanently in cold water.
    1. Their food source is different from that of other zooplankton.
    2. They probably do not rely on diel vertical migration to avoid predation.
    3. They migrate deeper than other zooplankton species do.
    4. Most species are found in very cold water.
    1. To point out that many aquatic species exhibit diel vertical migration
    2. To give an example of a species of fish that feeds on bioluminescent zooplankton
    3. To make a comparison between fish and zooplankton
    4. To support one of the theories explaining why zooplankton migrate
    1. To avoid ultraviolet light
    2. To avoid strong ocean currents
    3. To digest in colder waters
    4. To find abundant food sources
    1. No single explanation for all species can account for this phenomenon.
    2. Researchers have not been able to propose plausible theories to explain this phenomenon.
    3. All individual organisms have several reasons for migrating.
    4. Researchers were able to agree on an explanation for this phenomenon after many years of investigation.