Aristotle first proposed that was at the center of the solar system.
a. the sun
b. the moon
c. earth
d. jupiter

Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.

One does not belong why? ice, gold ,wood ,diamond and table salt

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?