1/12 Mammals are a dominant group in which era?
2
Cenozoic
Paleozoic
Mesozoic
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Explanation:

In cenozoic era ,mammals are a dominant group.

Mammals are a dominant group in Cenozoic era

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the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.