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A) Autotrophs

b) land mammals

c) humans

d) marine life

e) land plants

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Q: What group of organisms has been hit hardest by periods of increased glaciations?
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Has there been a ice age?

Strictly speaking, we are in an ice age now. It started about 2.6 million years ago and is composed of cold periods named "glaciations" and warmer periods named "interglacials" which is where we are now. The last glaciation ended about 10,000 years ago.


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