Plants are the only photosynthetic organisms to have leaves (and not all plants have leaves). A leaf may be viewed as a solar collector crammed full of photosynthetic cells.
The raw materials of photosynthesis, water and carbon dioxide, enter the cells of the leaf, and the products of photosynthesis, sugar and oxygen, leave the leaf.
I believe it is Nerve Cells
Correct me if I'm wrong.
Answer:
improper disposal of sewage
A nucleus cell contains chromosomes among other things.
Properly identifying each species.
Accurately recording his findings.
Not interfering with ecosystem while studying the birds.