"a" is the most probable answer but needs some elaboration.
Spiders eat their food through a process called external digestion. The gut, intestine and esophagus of a spider are designed to take in mostly liquids. The spider regurgitates digestive fluids onto the prey to digest it working more or less as a tenderizer. Once the prey begins to liquefy, it is chewed with the jaws (chelicerae) and the fluid is sucked back into the mouth together with some liquefied "'meat" from the prey.
The spider repeats this process as often as necessary to digest and ingest all but the inedible hard parts.
It is different types of species about .biological species concept, the phylogenetic species concept, and the morphological species (morphospecies) concept
Answer:
During photosynthesis, chemical energy is formed
Answer:
Allosteric enzymes bind at different site from the substrate binding site.
Explanation:
The activities of some enzymes, particularly those which form a part of a chain of reactions like metabolic pathways, are regulated internally. Some specific low molecular weight substances such as the products of another enzyme further on in the chain, acts as the inhibitor. Such a modulator substance binds with a specific site of the enzyme different from the substrate binding site. This binding increases or decreases the enzyme action. Such enzymes are called allosteric enzymes and the site at which they bind is called allosteric site.
Example: Hexokinase is an enzymes which converts glucose to glucose-6-phosphate in glycolysis. Decline in the enzyme activity by the allosteric effect of the product is called feedback mechanism, like the allosteric inhibition of hexokinase by glucose-6-phosphate,
In the Arctic, growing conditions for vegetation vary greatly. In the southern parts of the Arctic, plant communities can be vigorous with small trees and stands of low growing shrubs.
The further north one travels, the shorter and more sparse the ground cover becomes until in the high Arctic, which is a true desert. Here, the plants are scattered across stony ground and the most numerous plants are the lichens. Also here the carpet of flowers are only found below bird cliffs or other areas of high fertility.