Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

[Q]: Question: What is the connecting piece of a sperm packed with? Answer: mitochondria
[A]: The connecting piece of the sperm is packed with mitochondria. Mitochondria are organelles in cells that produce energy. Sperm use the energy to move.

[Q]: Question: Sensory organs that respond to particular sensory stimuli contain cells called what? Answer: sensory receptors
[A]: Sensory organs such as the eyes contain cells called sensory receptors that respond to particular sensory stimuli.

[Q]: Question: What hypothesis states that the biosphere is its own living organism Answer: the gaia hypothesis
[A]:
The Gaia hypothesis states that the biosphere is its own living organism.