An example of an animal that has a notochord but lacks a backbone is a

On a floor there are several 1-4 mm elongated drops leading away from a body lying in a pool of blood. the the forward wall there is a sigzag pattern and on the walls to the right side there is a linear patter

Number and variety of living organisms includes genetic, species, and ecological types

Which of these is a provisioning service people get from the ocean