2) Stomata are flanked by them...
Transpiration is controlled by opening and closing of the stomata, which is accomplished through swelling or shrinking of guard cells.
A group of similar cells that perform a single function is called a tissue.
Answer: a. mutation
Explanation:
A mutation is a change or alteration and a process that occurs in the DNA sequence of the organism. This happens due to the mistake in the DNA replication process or because of the environmental factors for example exposure to the UV radiation or due to smoking. These mutations either favors the survival of the organisms or they are lethal for the organisms.
Answer;
The above statement is true
Norepinephrine and epinephrine receptors are separated into the categories of alpha and beta.
Explanation;
-The adrenergic receptors are a class of G protein-coupled receptors that are targets of many catecholamines like norepinephrine and epinephrine produced by the body.The types adrenergic receptors are alpha, beta 1 and beta 2.
-Epinephrine and norepinephrine are released by the adrenal medulla and nervous system respectively. They are the flight/fight hormones that are released when the body is under extreme stress. During stress, much of the body's energy is used to combat imminent danger.
