Answer:a
Explanation: because naturally it occurs anytime it wants to
The question is asking to states on how i earth's early lang environment different than today's land environment and base on my research, I would say that in the past centuries or early ages, the Earth's land environment are compost of tree and plants and the air is still fresh. I hope you are satisfied with my answer and feel free too ask for more
One strand runs in the 5 to 3 and the other in the 3 to 5
