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Biology 26 Online
OpenStudy (anonymous):

List two things phytoplankton need to survive. Name at least two special adaptations phytoplankton have to stay in the photic zone.

OpenStudy (anonymous):

Sunlight and Water (from which they derive nutrients) are the two basic things that phytoplankton need to survive. To stay in the photic zone, they need to be light-weight. Some adaptations for this are: Projections - which increase their surface area leading to decreased rate of descent (seen on forams and radiolarians.) Diatoms are made of silica which is a lightweight material. Some have flagella, for e.g. dinoflagellates use two flagella to move about the water column and move towards areas of higher UVA/UVB concentrations.

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