Which came first: Complex life or high atmospheric oxygen?

[rangerrebew]

Which came first: Complex life or high atmospheric oxygen?
1/03/2018 02:00:00 PM Email ThisBlogThis!Share to TwitterShare to FacebookShare to Pinterest

We and all other animals wouldn't be here today if our planet didn't have a lot of oxygen in its atmosphere and oceans. But how crucial were high oxygen levels to the transition from simple, single-celled life forms to the complexity we see today?

Read more at https://archaeologynewsnetwork.blogspot.com/2018/01/which-came-first-complex-life-or-high.html#3x9q1ErLMD3QBzd4.99