Which identifies that a chemical reaction has occurred?
a. new substances are produced.
b. the color has changed.
c. bubbles have formed.
d. temperature has changed.

Embryos of different species look very similar, which shows that the organisms share a ancestor.

The grooves or folds of the brain are called

One of the hopes for solving the world's energy problem is to make use of the fusion reaction 21h +31h --> 42he + 10n + energy how much energy is released when 1 mol of deuterium is fused with 1 mol of tritium according to the above reaction? the masses of the atoms and the neutrons are as follows: 21h = 2.0140 amu 31h = 3.01605 amu 42he = 4.002603 amu 10n = 1.008665 amu. the speed of light is 2.9979 x 108 m/s.