Astudent pushes against a tree with a force of 10 newtons (n). the tree does not move. what is the amount of force exerted by the tree on the student?
1) 0 n
2) 5 n
3) 10 n
4) 20 n

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

Abnormal softening of a gland is known as

Coral reefs support more species per unit area than any other marine environment on earth. what is one way coral reefs are important to the health of the biosphere