news center

How life survived the big freeze

How life survived the big freeze

作者:皇捎诽  时间:2019-03-07 08:10:01  人气:

AREAS of open water may have provided a vital haven for life on Earth when the rest of the planet froze over about 700 million years ago. One nagging question about the “snowball Earth” theory has been how early animals could have survived if a thick ice sheet covered the entire planet (New Scientist, 6 November 1999, p 28). Photosynthesis would have been impossible in the dark, ice-covered oceans, so creatures should have starved. But using a simulation that includes ice-sheet dynamics,