We know of species that are no longer living because we have

a) observations
b) written records
c) fossil evidence
d) we do not know this

Which of the following is not a classification of marine organisms? a. benthos c. neritic b. nekton d. plankton select the best answer from the choices provided a b c d

The number of living organisms in a particular area is

Before the can be observed by using a transmission electron microscope, cells are sliced into very thin sections. what disadvantage does this procedure present in the study of cellular parts