Which represents a theory?

I observed three stars in the sky. The stars give off light.

Light travels at 300,000 kilometers per second. Stars are balls of hot gases.

Can you use tap water in oxygen concentrator

If the theory of evolution were true it would not be possible to classify organisms into distinct categories. True False

Natural sources of air pollution include ___. * internal combustion engines coal-fired electrical plants soil dust, wildfires, and volcanic dust evaporation of solvents

Vasopressin and aldosterone secretion are part of the body's compensation for

What do all viruses have in common?

You are attempting to recapitulate the transposon mutagenesis experiment without the benefit of counter selection due to unavailability of a DAP auxotroph Donor.

Which of the following is the primary function of proteins? A) transmits hereditary information from one generation to the next B) stored, concentrated energy C) builds and repairs cells and tissues in the body D) cushions and insulates organs

Which of the following best describes cell communication processes that are present in bacteria, yeast, and multicellular organisms?

During which phase of mitosis do the chromatids become chromosomes? a. telophase. b. anaphase. c. prophase. d. metaphase

How did the development of the hela cell line affect society?