Answer: D.
Explanation: Structural adaptations are physical features of an organism like the bill on a bird or the fur on a bear. Other adaptations are behavioral. Behavioral adaptations are the things organisms do to survive. For example, bird calls and migration are behavioral adaptations.
Answer:
having traits that help a single organism survive
I studied this before and I'm pretty sure it's D (sorry if I'm wrong)
Answer:
skin it protects from germs