If the field of view is .45 mm in diameter and three cells can fit lengthwise across the field of view, how long is one cell?

150 microns

Explanation:

0.45mm is converted into microns by multiplying by 1000

0.45*100=450 microns

Therefore if 450 microns= 3 cells

                                      ? =1 cell

1*450/3= 150 microns

it's anything that aren't producers and consumers.

explanation:

you've got to be clear on what "this" is

compost can be added to topsoil as a:

pesticide