During the early years of space exploration, it was shown that astronauts returned back to earth suffering from bone loss depending on their duration in space. How could this happen? What bones do you think were most affected, and what could be done to solve this problem?

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