0
During this time, simple anaerobic forms of life appeared and were followed by photosynthetic forms, which added oxygen to the atmosphere. Aerobic forms of life evolved, and eukaryotes appeared. Some of those organisms gave rise to multicellular forms that continued to increase in complexity. Few fossils exist from this time because the animals were all soft-bodied. Life existed only in the sea.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
What major changes life-forms occurred at the end of Precambrian time?
what major change in life forms occured at the end of precambrain time
Why is the shield also referred to as the Precambrian Shield?
Because it was created in the precambrian era...The Candadian Shield was formed in the Precambrian Era.The rocks of the Canadian Shield formed during the Precambrian time.
Why is the Precambrian time period segmented into very few parts?
The Precambrian time period is segmented into very few parts because:
Is the Precambrian time the longest or shortest part of Earth's history?
The Precambrian time period is the longest time period of Earth's history.Looks like we have the same worksheet in school :)
Which major division on geologic time came first?
Precambrian time
What animals existed during the Precambrian Time?
jellyfish-like animals, sea pen, and bacteria.
A life-form in the Precambrian time was?
cyanobacteria
What major changes life-forms occurred at the end of Precambrian time?
what major change in life forms occured at the end of precambrain time
What were the life forms in the precambrian era?
The Precambrian Era was the first emergence of complex, multicellular life forms on earth. Jellyfish and segmented worms were discovered to have lived during this time.
What major change in life-forms occurred at the of Precambrian time?
what major change in life forms occured at the end of precambrain time
Why is it difficult to study Precambrian time?
There is not many remains of the Precambrian time
What type of organisms dominated life during Precambrian time?
multi-celled organisms
What major change in life-form occurred at the end of the Precambrian time?
what major change in life forms occured at the end of precambrain time
What was the longest segment of the earth's history?
It was the Precambrian time period.
Is the Earth's surface hot or cool in the Precambrian Time?
It is hot in the Precambrian time
What happened during the Precambrian time?
Over most of Precambrian time 80 percent of earths history-the only life forms are bacteria ,which appear about 3,500 million years ago. multiple-cells marine animals like spriggina appear at the end of the era
What did jellyfish eat during the precambrian time period?
Jellyfish were not even alive during the Precambrian era because only single-celled organisms lived.
