Which of these contributes the most oxygen to our planet? a. Photosynthetic fungi
b. The Amazon Rain forest
c. the National Forests
d. Phytoplankton

What will happen to a population of predators if there is a sudden, temporary increase in the number of prey? a. the population of predators will be uniform with no change. b. the population of predators will increase first and then decrease slowly. c. the population of predators will increase continuously.

Grasses--> mice--> cats--> coyotes suppose 10,000 units of energy are available at the level of the grasses. what is the total number of energy units lost by the time energy reaches the coyote?

This is collection of data made by comparing objects in standard units. in science, the units are metric.