Freckles on someone's cheeks would likely be described as GROUPED. It is a collection of freckles.
<h3>Freckles and their function</h3>
The freckles sever as sunscreen capable of blocking the ultraviolet (UV) rays from penetrating the skin.
In consequence, freckles protect a person from harmful UV light which has potentially carcinogenicity.
The areas of the body where freckles are grouped have special sensitivity to ultraviolet light.
Learn more about freckles here:
brainly.com/question/9751167
Answer: A, all of them are organs!
(1) The varying number of muscle fibers that contract
<span>In most muscles, the number of muscle fibers in different motor units ranges from a few to hundreds. The nervous system can thus regulate the strength of contraction in a muscle by determining how many motor units are activated at a given instant and by selecting large or small motor unties to activate. </span>
some muscles are almost always partially contracted. In such muscles, the nervous system my alternate activation among the motor units, reducing the length of time any one set of fibers is contracted. Prolonged contraction can result in muscle fatigue due to the depletion of ATP and dissipation of ion gradients required for normal electrical signals.ing.
<span>(2) varying the rate at which muscle fibers are stimulated </span>
<span>single action potential produces a twitch lasting about 100 msec or less. If a second action potential arrives before the muscle fiber has completely relaxed, the two twitches add together, resulting in greater tension. Further summation occurs as the rate of stimulation increases. When the rate is so high that the muscle fiber cannot relax at all between stimuli, the twitches fuse into one smooth, sustained contraction called tetanus.</span>
Yes this is true. The Punnett square can be used for such purposes
Answer:
D.
Explanation:
It's the only choice that has three things that are made out of aluminum.
<em>Hope this helps :)</em>
