Compounds can be made by combining two or more atoms in
ratio,
A. certain sets of; a specific
B. certain sets of; any
C. any; a specific
D. any; any

Compare and contrast physical changes with chemical changes.

Quickly what are the following of organisms that existed over a wide area but only for a limited time period called a.soft fossils b.mold fossils c.index fossils d.trace fossils

Which of the following is the molecular formula for a simple sugar? a. cooh b. h2o c. oh d. c6h12o6