Which organisms benefit an ecosystem by adding oxygen and removing carbon dioxide from the
atmosphere?
a Algae
b Cows
C Birds
d Insects

Which law represents a balanced chemical equation?

How do living things obtain phosphorus

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