Most enzymes do in fact work on a single substrate in most cases, this is because of the enzyme - substrate specificity. Certain reactant molecules acting as substrates can only fit in the "lock" of particular enzymes and undergo a conformational change and result in Unique products to be released after the reaction has occurred.
A situation where friction would be desirable is rubbing your hands together to make them warm in the winter time.
Answer:
They adapt and survive because of Natural Selection
Explanation:
The sea animals die off if they cannot survive under certain conditions so they adapted to having eyes that can see, and other necessary survival tools for the bottom of the deep sea.
Non-bird dinosaurs lived between about 245 and 66 million years ago, in a time known as the Mesozoic Era. This was many millions of years before the first modern humans, Homo sapiens, appeared.
