Which of the following best describes a DNA molecule Double helix
Made of amino acids
Contains ribose
Constrain uracil

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels

What is responsible for the uneven heating between the poles and the equator on any given day

When a gasoline engine burns gasoline, what type of chemical reaction is occurring?