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.

[EX Q]: Question: The amniotic egg first evolved in what species? Answer: reptiles
[EX A]: Amniotic Egg. The amniotic egg is an important adaptation in fully terrestrial vertebrates. It first evolved in reptiles. The shells of reptile eggs are either hard or leathery.

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

[EX Q]: Question: Nonvascular plants lack vascular tissue and what? Answer: seeds
[EX A]:
Nonvascular plants lack seeds and vascular tissue.