Given a scientific question, generate a correct answer to it.

[EX Q]: What is the smallest particle of an element that still has the properties of that element is called?
[EX A]: atom

[EX Q]: Despite its small size, an erythrocyte contains about 250 million molecules of what?
[EX A]: hemoglobin

[EX Q]: What do communication satellites carry and use to provide energy during their missions?
[EX A]:
solar panels