The central nervous system is made up of the brain and spinal cord.
The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body.
please mark brainliest
<span>One way to repel the insect pests in an apple orchard without using chemical pesticides is by planting marigold near it. Marigold contains a compound known as Pyrethrum. It produces a certain smell that even gardeners doesn't like. Pyrethrum is also one of the components in making insecticides.</span>
<u>Answer</u>:
The enzyme activity decreases due to the denaturation of the enzymes.
<u>Explanation</u>:
Enzymes are built with proteins. Enzymes catalyze a reaction by binding to the substrate molecule in its active site. As temperature increases the rate of the enzyme activity increases because kinetic energy of the molecules get increases.
But when the temperature crosses approximately 37-40 degrees Celsius the structure of enzyme denatures due to breakage of its intra- and intermolecular bonds. The active parts of an enzyme changes and it can no longer bind to its substrate hence the enzyme activity decreases.
Answer: D) Pulmonary and aortic valves.
Explanation
There are two main heartbeats from a healthy heart.
The first beat is called the S1 or the lub, and it occurs when the atrioventricular valves (comprising the mitral and tricuspid valves) close.
The second beat is called the S2 or the dub, and it occurs when the semilunar valves (comprising the aortic and pulmonary valves) close.
Listening for heart beats is an essential part of cardiac auscultation.