Some of the characteristics that make a good index fossil are: A. the organism lived over a wide area.

B. They lived for long periods of time.

C. They lived for fairly short periods of time.

D. The organism was in abundance.

When an organism from a higher trophic level eats an organism from a lower trophic level all of the energy is converted to mass. all of the energy is converted to heat. most of the energy is converted to mass. most of the energy is converted to heat.

A substance is found to be made up of atoms from two elements the substance is

List two observations that could be evidence of a chemical reaction.

air is made up of mostly O2, N2 and CO2. if the total pressure of the air is 765 mmhg and P (n2) = 600 mmHg and P (CO2) = 38 mmHg then what is the partial pressure of the O2?

On the Celsius scale, one degree indicates the same temperature change as

Which expression represents the ΔH for a chemical reaction in terms of the potential energy, PE, of its products and reactants?

Identify the element that has a ground state electronic configuration of [ar]4s23d104p 3.

A geneticist has discovered a new compound that is made up of a small number of identical subunits. The subunits are joined end to end in long chains. Based on this information, what best can be concluded about these subunits? A. They are ketones. B.

What kind of cell keep dirt off your body's organs

How could one rapidly separate red #40 from zinc oxide? indicate every step.