The part of the experiment that is standard for comparison is the control. A control group is used to compare your evaluations to - they aren't exposed/involved with the experiment
The answer is D. Cloning produces more desirable traits in offspring, because the offspring will always have the same desired traits as the parent/clone. Hope this helps!
You would expect an earthworm to have no exoskeleton because as you see it is very flexible and soft. Organisms with such have body parts that are divided and an earthworm do not have any visible parts on them also having an exoskeleton would not allow an organism to move like an earthworm does.
Answer:
How long does it take for a body to break down?
The time it takes a corpse to go through the phases of decomposition depends on several factors, such as the complexion of the person or the place where it occurs.
Antibiotics are, initially, molecules naturally synthesized by microorganisms to fight against bacteria competing with their environment. This created a pressure of selection on the bacterial populations, leading to the appearance of resistant strains. In fact, when an antibiotic is used, only bacteria with defense systems against this molecule survive (and reproduce).
hope this helps