What are the first atoms that were formed? hydrogen and helium

photons and neutrons

iron and lead

protons and neutrons

Methane gas created by a cows flatulence especially in a large herd is a greenhouse gas. true or false.

Science which of the following is an example of a cyclic behavior that is seasonal? i think the answer is d, i just need to double check : ). a. running from predators. b. searching for water. c. hunting at night. d. migrating for warmth. ***

What does spontaneous generation mean?