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.
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Question: Question: In solids, particles can't overcome the force of attraction between them because they lack what? Answer: kinetic energy

Answer: In solids, particles can't overcome the force of attraction between them because they lack kinetic energy.


Question: Question: What are reversible physical changes in matter called? Answer: changes of state

Answer: Changes of state are reversible physical changes in matter called.


Question: Question: What cells secrete signaling molecules that promote sperm production and can control whether germ cells live or die? Answer: sertoli cells

Answer:
Sertoli cells cells secrete signaling molecules that promote sperm production and can control whether germ cells live or die.