Which process is the primary source for energy used by living organisms on earth?
a) fusion in the sun.
b) fission in the sun.
c) combustion in the sun.
d) disambiguation in the sun.

As a part of an experiment a student burns propane to produce carbon dioxide and water she remembers that she must follow the law conservation of matter when writing a balanced chemical equation which of these equation adheres to the law of conservation of matter

Motivation cannot be developed with practice; a person either possesses it or they do not.

Amount of liquid measured in l or lm