Approximately, when did the cultivation of plants begin?
a) 11,000 years ago
b) 110,000 years ago
c) 1,100 years ago
d) 55,000 years ago

Iwill give brainiest to first person who gets it ! what are 3 basic types of interactions we see in an ecosystem?

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.

How can you tell the difference between rough er from smooth er?