An idea that has been repeatedly tested and becomes widely accepted is a

A) fact.

B) law.

C) theory.

D) hypothesis.

Which of the following has a negative electrical charge? o cation only o anion only O Both cations and anions have negative charge.

Carbon-14 dating would be useful in finding the age of A. a fossilized fish found in a layer of rock estimated to be between 15,000 and 25,000 years old. B. a fossilized spore estimated to be over 200,000 years old. C.

Human somatic cells have 46 chromosomes. How many chromosomes are present in each gamete before fertilization?

A physician conducts a survey among 100 patients suffering from migraine headaches to assess the range of headache severity among his patients. What kind of data analysis would he apply to interpret the results obtained from this survey? a.

Secretion of which hormone is controlled by a positive-feedback mechanism? Progesterone Testosterone Oxytocin

From where dothe kenetic tiles collect energy

Landscapes will undergo the most chemical weathering if the climate is * A) cool and wet B) warm and wet C) cool and dry D) warm and dry

Why are sharks so successful at what they do?

The nucleus of an atom is comprised of

When the double stranded DNA helix is unwound, two single strands of DNA are formed. These strands have to be stabilized because their hydrophobic bases are exposed to water. The proteins that stabilize the two single strands are called