Definition of directional structure

The following image is of a diatom. it lives in water and gets food from photosynthesis. it is encased in a hard shell made of something similar to glass or sand . a diatom is a(n) because it has a) multi-celled organism; specialized parts. b) vertebrate; a skeleton. c) insect; an exoskeleton. d) single-called organism; only one cell.

Which image shows labeled organelles that are present only in plant cells?

Is a measure of the different types of organisms in a community. question options: tertiary secondary primary none of the above