How does a baby's respiration and circulation change when the baby is born?
A. The circulatory system pumps blood for the first time.
B. The baby now breathes oxygen instead of carbon dioxide.
C. The circulatory and respiratory systems must work on their own.
D. The baby's blood has oxygen for the first time.

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