<h2>
Answer:</h2>
<u>reactants, </u> <u>products</u>
<u>catalyst</u>
<u>activation energy</u>
<u>enzymes</u>
<h2>
Explanation:</h2>
Chemical reactions convert <u>reactants</u> to <u>products</u>. In nonliving systems, the presence of a(n) <u>catalyst </u>allows the reaction to proceed very quickly and have a lower <u>activation energy</u>. In living systems, this function is carried out by proteins called <u>enzymes</u>.
Answer:
b. Menopause
The end or cessation of menstruation is called menopause.
Explanation:
Menopause is the event when menses stop. Climacteric is more adequate to refer to the diseases associated with the decrease of ovarian function that will lead later to the event when menstruation cease, commonly known as menopause.
On the other hand, amenorrhea is the absence of some menstruation periods but during the reproductive period of a woman, and menarche is called to the event when the first menstrual cycle occurs.
Answer:
Because a food chain is very limited and only follows one path while a food web consists of many food chains made into one food web
Explanation:
Answer: ionotropic; metabotropic
Explanation:
A receptor can directly open the channel and exerts an ionotropic effect. The ionotropic effect takes place by the help of ionotropic receptors. These receptors are membrane bound receptor proteins which responds by the bonding of the ligand.
Due to ligand binding the channel opens and allows the movement of ions into the cells which helps in either increasing or decreasing the action potential.
The receptors can also bind to the ligand and produce metabotropic effect which means by the second messenger.
