According to the big bang theory , after the "bang" the earth universe remained dark until

Dwarf galaxies are select one: a. relatively rare. b. not very bright c. mostly spiral shaped. d. none of these.

Aflashlight produces light using energy from the batteries. in which order does the energy change form? a. from chemical to electric to light energy b. from electric to light to chemical energy c. from electric to chemical to light energy d. from light to electric to chemical energy

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?