Star formation begins when a.
gas and dust collapse inward.
c.
the fusion of hydrogen slows down.
b.
nuclear fusion starts in the core.
d.
the core becomes carbon and oxygen.

Please select the best answer from the choices provided
(Space and Environment)

What evidence supports the law of conservation of energy? a) mechanical energy is converted to chemical energy during photosynthesis. b) oxygen is made from the breakdown of carbon dioxide during photosynthesis. c)energy is absorbed by chlorophyll and becomes chemical energy during photosynthesis. d)the sun gives off light energy that is absorbed by plants.