An organism that has inherited a gene for a particular trait but does not show that trait is called a___
A variation. B genotype. C mutation. D carrier.

Of the pollutants that form acids in the atmosphere, which is easiest to reduce? a. sulfur dioxide b. nitrogen dioxide c. ozone d. carbon monoxide

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water