Why is it important that oxygen was ABSENT when life first evolved?
Volcanic activity is greatly reduced in the
presence of oxygen.
The chemical reactions necessary for the
evolution of life wermore likely to occur in
the absence of oxygen.

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

i hope this you

im not intirely sure but i think the anwser is d relative humidity