How do the circulatory and endocrine systems work together?
a.
blood circulates hormones around the body
c.
nerves signal endocrine glands
b.
hormones keep the heart pumping
d.
the blood brings waste to the kidneys

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water

Viruses can be transmitted through air, water, food, insect bites, and direct skin contact. once a virus gains entry into the body, it invades a host cell in order to? a. synthesize antibodies for defense b. deactivate the host cell's defenses c. access cell processes for reproduction d. metabolize host proteins and grow

Plants contain the carbohydrates starch and cellulose.in the spring when stem growth is at its fastest rate, cellulose production rates are increased in some plants. in the months with less sunlight