In order for cells in multicellular organisms to exchange gases, a circulatory system must be present.
a. true
b. false

Did the vinegar diffuse all the way to the center of any of the cubes? if so, which ones? what does this tell you about surface area-to-volume ratio and the diffusion rate?

A(n) is a molecule influences the way that a molecule reacts.

No plagiarizing ! 6th grade work! easy and 100 compare the parts of a cell and the cell as a whole to another common nonliving system (i.e., a car, a city, describe the parts of a cell and their primary function.