Which statement explains a difference between a cell wall and a cell membrane?

a: cell walls protect a cell, and a cell membranes do not.

b: cell membranes protect a cell, and cell walls do not.

The influenza virus cause the flu, but not other diseases. why?

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating

Identify the composition of oceanic and continental crystal rocks. in a model of earth’s interior, where would these rocks appear?