Acid rain occurs when sulfur dioxide in the atmosphere is oxidized in the presence of nitrogen dioxide. acid rain is an example of
a. a primary pollutant b. a secondary pollutant c. a tertiary pollutant d. none of the above

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

Diagram of the evolution of land plants?

Some tools have graduations to show multiple measurements. for example, a ruler may have graduations for both millimeters and centimeters. when measuring the length of an earthworm, which graduations would allow for the most accurate measurement? millimeters centimeters decimeters meters