Which adaptation helps polar bears maintain a constant internal temperature (thermal homeostasis) in cold weather? pleas I need it for my test right now!

The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons

Hybrid instruments that play sounds that are part sampled and part synthesized are known as:

What are two ways that harvesting algae from the ocean may benefit human society? how might the harvest of algae negatively impact the ocean communities where that algae grows? how could this be prevented?