Cell is limited in size for many reasons. Cells wouldn't be respire effectively if it were too large, because the surface area to the volume ratio would be too small.
The other thing is that if the cell were too large, it would be difficult for it to move nutrients and waste products in and out of the cell. So, cells are limited in size.
Explanation:
A. a chemical that kills plants and animals that come in contact with it
<span>A CD4 molecule on a lymphocyte interacts with an MHC-II molecule on an antigen-presenting cell.</span>
It shows how energy transfers from one organism to another and the amount of energy lost (10%) as the pyramid goes up