D. <span>controlled
is the right answer because a</span><span>n </span>experiment<span> in which an observer tests a hypothesis by looking for changes carried by alterations to a variable.</span>
A "micrometer" is the best unit of measurement for measuring the size of an atom.
Answer:
The answer is:
D. The population must be very large.
Hope that helps :)
The answer is tissue fluid. Tissue fluid holds far smaller quantity of protein molecules because they are too large to escape easily over the tiny holes in the capillary endothelium. Tissue fluid doesn't contain red blood cells because they are too large, but does comprise some white blood cells.
Answer: cellular respiration
Explanation: I hope this helps
