Why was it important to identify special stars or patterns of stars?

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

How many years would it take the atlantic ocean to grow 500 centimeters? show your work.

What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material