The tilt of the earth's axis, which essentially "turns" certain parts of earth so that some parts receive more direct sunlight
Capillaries: <span>any of the fine branching blood vessels that form a network between the arterioles and venules.</span>
Not sure what you mean but here's what i think
1.They are substrate-specific, because it's a lock-and-key mechanism.
2. They are re-used
3. They can catalyze reactions
4. They decrease activation energy
5. They are proteins by nature.
