7. In the biosphere, a. both trees and animals emit oxygen
b. trees emit oxygen and animals consume oxygen
c. animals emit oxygen and trees consume oxygen

Explain the importance of producers, primary consumers, secondary consumers and decomposers in an ecosystem.

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

If the dimensions of a cube-shaped cell with a length, height, and width of 1 micrometer were to double, what would be the cell's new ratio of surface area to volume? a.3 to 1 b.4 to 3 c.1 to 2 d1 to 6