question 3\n1 pts\nthe earth’s atmosphere 4.6 billion years ago was mainly composed of ______ and…

question 3\n1 pts\nthe earth’s atmosphere 4.6 billion years ago was mainly composed of ______ and ______.\nhydrogen, helium\nnitrogen, helium\nnitrogen, oxygen\nhelium, carbon dioxide\ncarbon dioxide, oxygen

question 3\n1 pts\nthe earth’s atmosphere 4.6 billion years ago was mainly composed of ______ and ______.\nhydrogen, helium\nnitrogen, helium\nnitrogen, oxygen\nhelium, carbon dioxide\ncarbon dioxide, oxygen

Answer

Brief Explanations:

Early Earth's atmosphere had hydrogen and helium from solar nebula. Other gases came later.

Answer:

hydrogen, helium