Plants are set up in a greenhouse. 1/3 of potted plants are grown under red light, 1/3 under green light, and 1/3 under natural light. Plant biomass is measured at the beginning of the experiment and after a 28 day period.

In this study, is the amount of plant growth the independent or dependent variable?

dependent
independen

Which list shows the levels of organization of an organism in hierarchical order from left to right, from the smallest to the most complex?

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

Resperation is a way to release carbon back into the atmosphere