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likoan [24]
3 years ago
15

What is the immune systems first line of defense against invading pathogens

Biology
1 answer:
GREYUIT [131]3 years ago
8 0
The first line of defense, <span>includes physical and chemical barriers. These include your skin, tears, mucus, cilia, stomach acid, urine flow, bacteria and white blood cells called necrophiliacs.</span>
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"27 days, 7 hours, and 43 minutes for our Moon to complete one full orbit around Earth"
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Explain what it means for a section of DNA to be considered a molecular clock. Be sure to discuss the importance of neutral muta
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  <span>Neutral mutations are neither harmful nor beneficial. 

Therefore, they are invisible to natural selection. (Since they neither improve nor worsen one individual's chances of survival and reproduction over another.) 

However neutral mutations can still spread into the population by just random replications and matings. This is called genetic drift. 

In other words, they are 'silent'. They are mutations that exist and propagate in populations, but seem to have no effect at all. 

The reason they can become important to evolution is that a day can come when they *do* have an effect. In other words, even though an individual mutation may have no immediate effect on survival or reproduction, a *combination* of neutral mutations may provide some new benefit or harm ... at which point natural selection *will* act on that combination. 
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I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
6 0
3 years ago
What idea is expressed in the first paragraph? preface to leaves of gras?
Anit [1.1K]
The one when u die and the foodm stoore
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3 years ago
Which of the following produces the greatest amount of carbon dioxide?
Akimi4 [234]

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A friend of yours claims to have identified a gene that causes a human disease! Your friend says that they have sequenced the DN
sattari [20]

Answer: Point mutation is easily reversible, thus non-lethal

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However, note that a point mutation can be easily reversed by another point mutation; so, the claim that a nucleotide difference in the Hsr12 gene caused the human disease is inaccurate

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