D) Fossils could not be found in that layer of rock.
Wait this is highschool biology?!
Woah... thought it would be harder....
Anyways, see "micro" means really small, so small that your bare eyesight can't take it (or see it, I don't care). A microscope was meant to see things that our eyes can't. Since humans cant see microlife we use a microscope.
Mind Blown...
Answer: Soil is the earthworm's habitat.
Explanation: The worm gets the food from the soil and also lives in to soil, that is the basic living needs for a habitat.
To make changes to it or to take out some genes of interest
Answer:
I looked it up and the answer is fluid mosaic.