Biology, 20.01.2021 07:20 eddy2616

What happened as a result of higher oxygen levels millions of years ago? (A)
Flowers started to be pollinated by bees.
(B)
Many insects had shorter lifespans than they have today.
(C)
Many insects grew to be bigger than they are today.
(D)
Flowers were unable to produce nectar.

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What happened as a result of higher oxygen levels millions of years ago? (A)
Flowers started...