In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Question: Where are some of the greatest concentrations of species found? Answer: in the tropics
Some of the greatest concentrations of species are found in the tropics.

Question: What kind of parasites are nearly all ticks that live on the body surfaces of reptiles or mammals? Answer: bloodsucking
Bloodsucking parasites are nearly all ticks that live on the body surfaces of reptiles or mammals.

Question: Which sequence identifies the levels of organization of body structures in a human from simplest to most complex? Answer: cell → tissue → organ → organ system

The sequence cell → tissue → organ → organ system identifies the levels of organization of body structures in a human from simplest to most complex.