Demographic information can help cities plan for a changing human population structure. Which type of demographic information would help a city decide whether to build a new assisted-living home for senior citizens?
A. Age structure
B. Birthrate
C. Death rate
D. Growth rate

Which of the following is an example of negative reinforcement? a.marty knocks over his mother's prize fern so she gives him a time out. b.gwen mows the lawn and her dad takes her out for ice cream. c.tara takes an aspirin, and her headache begins to go away. d. peter comes in late from his lunch and is fired from his job.

Each autumn the forest floor is covered by leaves that have fallen from trees which type of organisms is most effective in decomposing the leaf tissue allowing the nutrients and minerals to be recycled in the environment?

What is the function of the organelle labeled a in the diagram?