Q: What is the primary function of skin cells?
A: to provide a physical barrier to the body
Q: When Javier exercises, his muscle cells need more oxygen. Which would help Javier's muscle cells receive more oxygen?
A: increasing the rate his heart beats
Q: What is one way that humans can maintain good health?
A: exercise daily
Q: Which of the following statements applies to all states of matter?
A:
Matter is made up of particles called atoms.