Which mineral is never found freely in nature but is extracted from a chemical compound?

A. Coal

B. Salt

C. Gold

D. Silicon

Which diagram best illustrates the relationship between the number of cells, tissues, and organs in a complex multicellular organisms

If the concentration of sodium is great outside of cell then inside a cell which process can move sodium outside of the

1. Biotic factors like wolves can have an effect on abiotic factors like rivers. True or False 2. Energy can not be transferred from one trophic level to the next. True or False 3. Extirpation is when a species disappears from a part of its range.

What happens to pepsin when it leaves its normal digestive location, and moves to where trypsin is located?

The theory that organisms can arise from inanimate matter is called Choose one: A. spontaneous generation. B. endosymbiosis. C. fermentation. D. germ theory.

Fetures of unwarped mountains

What scientist discovered cells by observing cork with a homemade microscope

How can scientists learn about the evolution of eyes, given that there is very little fossil evidence?

Which population would increase most if the insects were eliminated

What mineral is used as a coating for steel?