Plankton, Which Are Associated with Fossil Assemblages from the Proterozoic

Multiple Choice

Plankton, which are associated with fossil assemblages from the Proterozoic eon through the present day, are best described as

A) filter-feeding organisms.
B) small floating organisms.
C) among the first complex, multicellular animals to appear after the Cambrian explosion.
D) certain forms of amber that are particularly suited to preserving fossils.
E) the secretions of certain Cyanobacteria.