Why is photosynthesis vital for life?
a. photosynthesis maintain atmospheric levels of oxygen and carbon dioxide.
b. photosynthesis is a direct means of energy production for many organisms.
c. photosynthesis is an indirect means of energy production for many organisms.
d. all of the above

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area

Discuss the functions of epithelial connective nerviud and muscular tissues

All phases of matter may have a fixed mass