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

Ex Input:
What term is used to describe birds that hunt, eat mammals, and other birds?

Ex Output:
raptors

Ex Input:
What do communication satellites carry and use to provide energy during their missions?

Ex Output:
solar panels

Ex Input:
Amplification that occurs in which cells often requires signal transduction pathways involving second messengers?

Ex Output:
sensory receptor