Question

7 which combination of gases did scientists hypothesize were contained in earths early atmosphere? water vapor and oxygen carbon dioxide, water vapor, and nitrogen hydrogen, helium, and nitrogen carbon dioxide, oxygen, and hydrogen skip 6/49 complete

Explanation:

Scientists believe Earth's early atmosphere had carbon - dioxide, water vapor, and nitrogen. Oxygen was not abundant in the early atmosphere as photosynthesis had not yet developed to produce significant amounts of it. Hydrogen and helium were present in the early solar nebula but escaped Earth's gravitational pull relatively quickly.

Answer:

Carbon dioxide, water vapor, and nitrogen