Which is a cause of mechanical weathering?

A.

sunlight

B.

natural acids

C.

physical forces

D.

oxidation

Substance X is more concentrated outside the cell than inside the cell. Substance Z is more concentrated inside the cell than outside the cell. Assume that both substances can pass freely through the cell membrane. Over time, what will happen?

A product that is popluar for a short period of time

If two minerals have the same chemical composition but cleave into different shapes, which must be true? A. They have different streaks. B. They have different arrangements of atoms. C. They have different hardnesses. D. They have different colors.

What happens with insecticides and herbicides that we put on our lawns?

What is a baby made of

How many times do the nostrils of a frog open and close in one minute

What regulates the enzymes present in an organism A. Phenotype B. Genotype C. Proteins D. Carbohydrates

What is the importance of the excretory system?

What are four sources of minerals?

How many organisms depend on the squid as a source of food?