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.

[Q]: Question: What do ecosystems absorb on the earth? Answer: energy
[A]: Energy do ecosystems absorb on the earth.

[Q]: Question: What is the term for the exchange of genetic material between non-sister chromatids of homologous chromosomes? Answer: crossing-over
[A]: Crossing-over is the term for the exchange of genetic material between non-sister chromatids of homologous chromosomes.

[Q]: Question: How many cycles do cells have? Answer: four
[A]:
Cells have four cycles.