When sodium metal is placed in water it releases large amounts of heat and light. what kind of a reaction is this an example of? a. a fusion reaction b. a fission reaction c. an exothermic reaction d. an endothermic reaction

Many animals cannot sweat to maintain a stable body temperature. what is one other way animals can cool down?

What percentage of light hits earth's surface directly?

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