Why do we say that "an enzyme is reusable"?
a) the enzyme does not actively take part in the reaction. it just indicates that the reaction is complete.
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b) enzymes react with the substrate molecules to form products and become denatured in the process.
c) enzymes ensure that the reaction continues without inhibition even if conditions such as temperature and ph are changed.
d) the products of the reaction are released from the active sites of the enzyme, allowing other substrate molecules to bind with the sites.

The correct option is D) The products of the reaction are released from the active sites of the enzyme, allowing other substrate molecules to bind with the sites. 

Enzymes are protein molecules which have a specific shape complimentary to the substance they act on, known as the substrate. The region where the reaction occurs is the enzyme's active site. However, when the reaction is complete, the products leave the active site and the enzyme is once again available for reaction. This means that the enzyme is unchanged through the reaction. This is why enzymes are known as biological catalysts.

Hunting in the darksome fish rely on senses beyond sight. in the darkness of the marianas trench, a fish called the rattail has an extremely sensitive sense of smell. the fish uses scent, rather than sight, to steer toward food. once it's near food, the rattail uses a special organ on the bottom of its chin to guide itself by feel.marine snowone staple of the deep sea diet is "marine snow," flakes of organic, edible substances that sink down from the upper ocean. animals at the ocean's bottom find sustenance in everything from the bodies of dead creatures to fecal matter. marine snow is diverse enough to support numerous species. for instance, several species of snails and worms feed exclusively on deceased whales.microorganismsthe deep sea is an intricate ecosystem, and even the ocean floor itself plays a part. hydrothermal vents are cracks in the sea floor where erupting magma mixes with ocean water to produce plumes of hot, sulfur-rich chemicals. some microbes can use these chemicals for energy, sustaining their existence and that of the animals who depend on their roles in the deep sea food chain.

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