The role of red blood cells, or erythrocytes, is to carry _____ in our circulation.

A population with rapidly expanding exponential growth would be best represented by a graph with a/an ______-shaped curve.

_______ is the net movement of particles from an area where there are many particles of the substance to an area where there are fewer particles of the substance.

Which sequence correctly illustrates a plausible food chain?

Which of the following combination of organelles are only found in plant cells?  

The figure shows a food web. In this web, there are ____ producers.

When the number of births exceeds the number of deaths, this results in

Aa is___ while AA and aa are ___.

The organ that supports the transport of nutrients and waste between the mothers and fetus’ blood is the

Which movement of substances through a cell membrane against a concentration gradient requires energy?