1) D because even if you rip all them out, the seeds of the plant are still in the ground
2) D because of the current, short-legged birds might get swept away
3) D because all of the other options would most likely not enforced.
the air's oxygen is partially replaced by carbon dioxide. This is because of the gas exchange that occurs so we can live.
Answer:
I think the answer is C: An experiment that includes one group for which the scientist controls all variables
Explanation:
the student should scrap off the layers until a very thin layer remains and put it back on the microscope then the student will be able to view the details of only one cell layer