After a long soccer practice, Jack felt his pulse increase. As he cooled down, his pulse began to slow. Since he'd been studying the circulatory
system in science class, he knew why his pulse slowed.
What is the main structure of the circulatory system that makes the blood move through the body?
O
A. artery
O
•
B. lymph vessels
C. heart
D. lungs

Which of the following is not considered an appendage of the skin? nails glands follicles none of the above

In which layer do organisms on earth love?

Match the following terms and definitions. 1. species that are adapted to live in equilibrium at carrying capacity population density 2. population growth that reaches equilibrium and carrying capacity population 3. death rate mortality 4. birth rate k-selected 5. a group of interacting individuals of the same species within the same geographic area natality 6. the number of organisms living in a particular area logistic growth