And give explanation
hydrogen has 2 stable isotopic forms- hydrogen-1 and hydrogen-2. which isotope has the highest percent abundance? is there more hydrogen-1 or hydrogen-2 in the world? how can you tell?

Can someone me with 6 to 10 plz this is for masteries test.

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

Why must humans find substitutes for many minerals found on earth? (a) form at an extremely slow rate (b) controlled by other countries (c) too deep in the earth to collect