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Iteru [2.4K]
3 years ago
13

Why is variation useful

Health
2 answers:
ira [324]3 years ago
6 0
Genetic variation is an important force in evolution as it allows natural selection to increase or decrease frequency of alleles already in the population. ... Genetic variation is advantageous to a population because it enables some individuals to adapt to the environment while maintaining the survival of the population.
Gemiola [76]3 years ago
4 0
Exactly what they said^
You might be interested in
I need help ASAP! Will give brainliest!
Marrrta [24]

Answer:

Frontalis: the frontalis muscle is used to generate these types of facial expressions. The frontalis muscle functions to lift the eyebrows and wrinkle the forehead, which is a common facial expression of being shocked or scared.

masseter: Muscles of facial expression include frontalis, orbicularis oris, laris oculi, buccinator, and zygomaticus.

orbicularis oris: Orbicularis oris is a complex circular muscle that surrounds the orifice of the mouth and forms the majority of the lips. ... It closes, protrudes and compresses the lips. Performing these actions, orbicularis oris facilitates speech and helps in producing various facial expressions, such as anger, sadness and others.

orbicularis oculi: Under the control of the facial nerve (cranial nerve VII), orbicularis oculi closes the eye. Depending on the degree and frequency of closure, this action can be essential for hydrating the eye, protecting it or non-verbally conveying a message with a cheeky wink.

temporalis: The facial muscles serve 2 major functions for the body: mastication and facial expressions. The muscles of mastication include the temporalis, medial pterygoid, lateral pterygoid, and the masseter (buccinator muscle is an important accessory of chewing). Another important function is facial expression

zygomaticus major: Image result for zygomaticus major facial expression

The zygomaticus major is a muscle of the human body. It is a muscle of facial expression which draws the angle of the mouth superiorly and posteriorly to allow one to smile.

sternocleidomastoid: muscle is one of the largest and most superficial cervical muscles. The primary actions of the muscle are rotation of the head to the opposite side and flexion of the neck. The sternocleidomastoid is innervated by the accessory nerve.

Depressor anguli oris: pulls the angle of the mouth inferolaterally. Its action plays an important part in facial expression, as it helps expressing feelings of sadness or anger.

trapezius: muscle is a large superficial back muscle that resembles a trapezoid. It extends from the external protuberance of the occipital bone to the lower thoracic vertebrae and laterally to the spine of the scapula. The trapezius has upper, middle, and lower groups of fibers.

<em>I hope this would help you</em>

3 0
2 years ago
Which can reduce the likelihood of HIV infection but is not 100% effective?
inna [77]

post-exposure prophylaxis. PEP for short. It involves taking medicine after contact with HIV.  

Treatment must begin within 72 hours. PEP is only available from a healthcare provider, emergency room, urgent care clinic, or HIV clinic.  

It is not 100% effective. And follow-up  

HIV testing is required

5 0
3 years ago
Read 2 more answers
Psychology
Tanya [424]

Answer:

its A

Explanation:

She seems self-centered and she exagerizes her performance

4 0
2 years ago
Read 2 more answers
How does the liver function in relation to digestion
vovikov84 [41]
<h3>♫ - - - - - - - - - - - - - - - ~<u>Hello There</u>!~ - - - - - - - - - - - - - - - ♫</h3>

➷ It secretes bile which helps in the digestion of fats.

<h3><u>✽</u></h3>

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

↬ ʜᴀɴɴᴀʜ ♡

6 0
2 years ago
Select all the correct answers.
Gekata [30.6K]

Answer:

I have 3 answers for this

Explanation:

A,C,E

4 0
2 years ago
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