The general term that describes the sediment that the river is carrying ?

In the practice of science, this type of reasoning is used to develop explanations.

Which best describes this behavior? it is beneficial only to the males that do not fertilize eggs. it is beneficial only to the female workers that are not fertilized. it is beneficial to each one of the individual colony members. it is beneficial to the whole species, but not to all of the individual members.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.