Which of the following describes coccolithophores?
1) a type of algae in which the chlorophyll pigments dominate the visible color that resembles a grassy to apple green
2) a type of single-celled phytoplankton that lives ubiquitously throughout the upper strata of the ocean
3) a type of marine plankton in which half of the species are photosynthetic and the rest are exclusively heterotrophic
4) a type of filter feeder that siphons food particles through a mucous membrane filter
