Chemical reactions carried out by living systems depend on the ability of some
organisms to capture and use atoms from nonliving sources in the environment.
The specific subset of these reactions that break down nutrients in food can be
described as .
(a) metabolic.
(b) catabolic.
(c) anabolic.
(d) biosynthetic.

(B) Catabolic.

Explanation:

The metabolism refers to the chemical reactions which are used by the organisms to sustain their life therefore metabolism is considered a characteristic feature of the living organisms.

The metabolism involves either the formation of a molecule from the smaller subunits or monomer through a process known as anabolism and other involves the breakdown of the larger molecule into smaller subunits through catabolism.

In the given question, the breakdown of the food particle which is usually the complex biomolecules is broken down into simpler subunits through a catabolic reaction. The smaller subunits of molecules are easily absorbed ad then utilised by the body.

Thus, Option-B is the correct answer.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms