Identify the following as radiolarians, foraminiferans, or both, using the following key (use the letters in the blanks to answer the questions):
R = Radiolarians
F = Foraminiferans
RF = Radiolarians and foraminiferans

- These have endoskeletons composed of silicon dioxide.


-Globigerina sp. is an example.

- These have colorful shells composed of calcium carbonate.

-Fossil species of these are helpful in correlating the age of geologic strata.

-These have threadlike, branched pseudopods.

- Stylatractus sp. is an example.

-These are fossil species that form limestone.

- Sediment of these organisms can be greater than 4,000 meters thick.

- These have thin, stiff pseudopods.

- These are found in marine environments.