The endocrine system has that act as chemical messengers. a. glands b. hormones c. alveoli d. bronchioles

What is a small pants but the m word mean my friends call me that a lot im 5 year old

Viruses can cause the following, check all that apply. a. sore throat b. measles c. ear infection d. flu e. chicken pox

Scientists believe that differences in cause hot, plastic-like rock in the asthenosphere to rise toward earth's surface. a. density c. weight b. magnetism d. composition select the best answer from the choices provided