The correct choice is D.
A karyotype is the layout of chromosomes, in size order from largest to smallest. These chromosomes are ALWAYS in pairs, meaning that it would be easy to notice which of the 23 chromosome pairs have 3 chromosomes instead of the usual pair.
When a microbe that is not part of the normal biota enters the body, it is likely to first encounter first line of host defense.
The term "normal microbiota" describes the microorganisms that are present in every human's conjunctiva, oral mucosa, skin's surface and deeper layers, saliva, and gastrointestinal tracts. The host employs a number of defences to defend against infection.
Mucus, which has a variety of normal microbiota that compete with and may even destroy invasive bacteria and virae, is one of the body's first lines of defence.Once a virus or bacteria penetrates the skin and mucosa, the host may experience changes that lessen the invader's power. A fever is one instance of such a shift.
Therefore, When a microbe that is not part of the normal biota enters the body, it is likely to first encounter first line of host defense.
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Smoking causes changes to homeostasis throughout the body best explains the relationship of cause and effect which DeShawn best explains and is denoted as option B.
<h3>What is Homeostasis?</h3>
This is common in biological systems and is the process in which they maintain a stable internal environment through series of techniques such as excretion etc.
Smoking will disrupt the homeostasis in the body as a result of the presence of a high amount of carbon dioxide as against that of the non smoker which has a large concentration of oxygen.
This makes the body internal environment unstable and is therefore the reason why changes to homeostasis was chosen as the correct choice.
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The digestive tract overlaps in many layers (It can even reach microsocpic overlaping) allowing it to fit inside a person's body.
