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Romashka [77]
3 years ago
14

Which causes natural selection to occur?

Biology
1 answer:
Rufina [12.5K]3 years ago
5 0

Answer: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population.

Explanation:

Hope one of those are the options

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What are the body’s three defenses? How do they differ from each other.
Artemon [7]

Answer:

- Physical and chemical barriers

- non-specific innate responses

- specific adaptive responses

<u>The differences are...</u>

The first barrier is the physical and chemical barrier. It is the first line of defense when in contact with outside sources, this can be through the skin, earwax, nose-hair, etc.

The second barrier, the non-specific innate response, is after these outside sources have somehow managed to pass through the first barrier. They come into contact with cells and enzymes that help to defeat them.

The third barrier, the specific adaptive response, is the body's way of dealing with pathogens that the body has encountered before. (B cells activate)

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2 years ago
During a pertussis infection, the pathogenic bacterium Bordatella pertussis produces tracheal cytotoxin, which destroys cilia. W
fiasKO [112]

Mucus would most likely accumulate in the respiratory tract as a result of ciliary destruction.

Pertussis (whooping cough) is a highly contagious respiratory tract infection. A severe hacking cough is followed by the a high-pitched breath intake that sounds like "whoop" in many people. Before the vaccine, whooping cough was thought to be a childhood disease. Whooping cough now primarily affects children who have not received the full course of vaccinations, as well as teenagers and adults whose immunity has waned.

Deaths from whooping cough are uncommon, but most commonly occur in infants. That is why it is critical for pregnant women and others who will have close contact with an infant to be immunized against whooping cough. The best way to avoid pertussis is to get vaccinated. Check that you and your loved ones have received their pertussis vaccines.

To know more about the Pertussis, here

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5 0
1 year ago
A strand of DNA has the bases AGTAAC. Using letters, show the matching DNA strand.
kkurt [141]
The matching DNA strand would be A - T, G - C, A -T, A - T, C - G, or in other words TCTTG (because you had the strand AGTAAC). 

Always remember that A pairs with T, G pairs with C, T obviously pairs with A, and C obviously with G.
5 0
3 years ago
What is competition what organism be competing for
lora16 [44]
Organism in an eniornment can compte for food
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2 years ago
Which of these statements about the responses of plants is correct?
ziro4ka [17]

Answer:

shoots grow towards gravity

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2 years ago
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