The atomic mass of an element is
a. a weighted average of the masses of an element’s isotopes.
b. twice the number of protons in one atom of the element.
c. the sum of the protons and neutrons in one atom of the element.
d. a ratio based on the mass of a carbon-12 atom.

explain

Energy flows from the producer level to the level. is called

Adiver named jacques observes a bubble of air rising from the bottom of a lake (where the absolute pressure is 3.50 atm) to the surface (where the pressure is 1.00 atm). the temperature at the bottom is 4.00 ∘c, and the temperature at the surface is 23.0 ∘c. what is the ratio of the volume of the bubble as it reaches the surface (vs) to its volume at the bottom (vb)? if jaques were to hold his breath the air in his lungs would be kept at a constant temperature. would it be safe for jacques to hold his breath while ascending from the bottom of the lake to the surface?

Does heating a metal wire increase or decrease its electrical resistance? why?