4. Which statement is true of all biotic factors? A. They are alive
B. They are renewable.
C. They use photosynthesis.
D. They use chemosynthesis.

The many volcanoes located along the edge of the pacific ocean make up the ring of fire. how does subduction play a role in the volcanic activity in the ring of fire?

Natural resources are any materials that humans obtain from the earth to meet our wants and needs.

Which of the following explains why a tree is often used as a model to represent the principle of common descent