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3 years ago

Many countries use DDT to control the spread of deadly __________.

Biology

2 answers:

djverab [1.8K]3 years ago

8 0

Many countries use DDT to control the spread of deadly Malaria.

zhuklara [117]3 years ago

6 0

DDT is used to repel and kill disease carrying mosquitos <span />

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Help cuh im to lazy and o don fill like doin this ill give u 25 points

aniked [119]

It’s easy bro just do it

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3 years ago

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Why did coal never form in Australia?

Archy [21]

C. Australia was covered in ice during a key geologic period.

at the time of coal forming, Australia was closest to the south pole, so it was too cold.

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3 years ago

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small group of 100 people decide to isolate themselves from the world and move to a small and remote deserted island. Out of thi

irina [24]

Answer:

Frequency of p $= 0.684$

Frequency of p $= 0.316$

Number of individuals with homozygous dominant (AA) $= 47$

Number of individuals with heterozygous (Aa) $= 43$

Number of individuals with homozygous recessive (aa) $= 10$

Explanation:

Out of 100 people, 10 have albino skin (aa)

So, the frequency of homozygous recessive individuals $(q^{2})$ is $\frac{10}{100} = 0.1$

Now, q will be

$= \sqrt{q^{2} } = \sqrt{0.1} \\= 0.316$

As per Hardy Weinberg's equation -

$p + q = 1$

Substituting the value of q in above equation, we get -

$p + 0.316 = 1p = 1 -0.316\\p = 0.684$

Now the frequency of homozygous dominant (AA) will be

$p^{2} = 0.684^{2} \\= 0.467$

Hence, out of 100 people $0.467 * 100 = 46.7 or 47$ people are homozygous dominant (AA)

Like wise out of 100 people $0.1 * 100 = 10$ people are homozygous recessive (aa)

As per As per Hardy Weinberg's equation-

$p^{2} + q^{2} + 2pq = 1\\$

Substituting the values in above equation, we get -

$0.467 + 0.316 + 2pq = 1\\2pq = 1 -( 0.467+ 0.1)\\2pq = 0.433$

So, out of 100 people $0.433 * 100 = 43.3 or 43$ people are heterozygous (Aa)

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3 years ago

Because lymph vessels are very low-pressure conduits, movements of adjacent tissues are important in propelling lymph through th

Fudgin [204]

Answer:

True.

Explanation:

Lymphatic system is one of the most important system of the body that carries the lymph fluid towards the heart. This system plays an important role in the body immune system.

The pressure in the lymph vessels are very low. The movement of adjacent tissue in the lymph is important to propel it through the lymphatics. The intrinsic or extrinsic compression are important for the lymph flow.

Thus, the correct answer is True.

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3 years ago

How might the poison dart frog population suddenly increase? How might this affect the ecosystem?

umka2103 [35]

If the predator that feeds off the dart frogs goes extinct or migrates to a different area then the dart fronts will have a much larger population. This means that the resources the dart frogs rely on will start to deminish and their prey will have smaller numbers

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2 years ago

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