1. marine scientists get information about aquatic populations from which of the following sources?
- news reports
- helicopter pilots
- commercial fishermen
- individuals on the beach

2. countershading is an example of
- a trait unique to sharks
- a technique used for hunting
- an adaption to the environment
- the issue created by light in the ocean

3. phytoplankton is the first link in the food chain.
- true
- false