<span>The human impact on biological diversity. How
species adapt to urban challenges sheds light on evolution and provides
clues about conservation</span>
<span>The cell membrane acts as the gatekeeper of the cell, determining what goes in and out.</span>
A)Enzymes speed up reactions that help sustain life
It began 3.5 billion years ago
The sun is the ultimate source of energy and the process is Photosynthesis.