They produce oxygen they are used as shelter, they are used for blocking the shade, they sustain other animals that sustain the planet and us.
The answer would be D. variation
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
Answer:
self-copying molecules ate the primordial soup
Explanation:
