Which two statements describe organ systems working together to remove wastes from the body?
A. The circulatory system carries oxygen-rich blood into muscles in
the legs.
B. The respiratory system exhales carbon dioxide that enters the
lungs from blood vessels.
C. The digestive system breaks down food into molecules that can
move into the blood.
O D. The integumentary system gives off thermal energy that comes
from blood vessels.

Which description best defines the nervous system and its two main branches? a: the message center of the body, split into the autonomic nervous system and the somatic nervous system b: the control panel of the body, split into the central nervous system and the exterior nervous system c: the message center of the body, split into the central nervous system and the peripheral nervous system d: the control panel of the body, split into the brain and the spinal cord

Which food preservation method can people use at home? a. fermentation b. irradiation c. pasteurization d. thermal processing

Explain why hiv is a life-threatening sti.