Fossils of fish appeared approximately 500 mya during the
a. archaen
c. proterozoic
b. cambrian
d. phanerozoic

the graph shows the price of a good compared to the quantity supplied.

this graph demonstrates how

    [d]:   " the amount consumed greatly changes with the price. "

because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. so, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.