Take the Galapagos birds as an example...
Birds develop different traits for different areas and climates.
phanerazoic
if there was no oxygen then why were there dinosoars
Answer:
To understand how our world is evolving, scientists use computer programs called climate models to forecast future climate. Climate models function in the same way that a computer lab does. Climate models are computer programs that scientists use to analyze how our world is changing.
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Answer:
Explanation:the animal cell would lose its shape as the plant cell has a cell wall which gives shape and protection but the animal cell don't have a cell wall.
Mainly because of time. The precambrian era started millions of years ago, and organisms didn't have enough time to change and adapt to form new species, since this is something that takes a long time to occur.
Hope it helped,
BioTeacher101