Alex is writing an article on primitive people. He has to write about the use of biomass in primitive times.
What should he write?
A. Primitive people used stones as tools.
B. Primitive people used animals as pets.
C. Primitive people used wood as a source of energy.
D. Primitive people used coal for cooking food.

Acommon kind of mechanical weathering is called

2. how does the miller-urey experiment fall short of demonstrating that life can arise from inorganic molecules? explain. a. it doesn't show a leap between a collection of amino acids and a single-celled organism. b. it recreates the conditions that existed at the earth's beginning, but no molecules form as a result. c. it doesn't provide evidence of the formation of amino acids. d. it doesn't show how multicellular organisms developed from unicellular organisms

How does photosynthesis show the conservation of mass and energy?