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blagie [28]
3 years ago
7

Which best summarizes the peppered moths in England after the Industrial Revolution?

Biology
2 answers:
lys-0071 [83]3 years ago
8 0
A. the history is the moths that where white where able to blend in the trees before the pollution of the trees causing the trunks to turn black and the frequency of the blacks being seen to be more then the whites
Delvig [45]3 years ago
4 0

Answer:

A. The allele frequency changed

Explanation:

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_______________, which causes abdominal pain and diarrhea, multiplies rapidly in prepared foods (
Lyrx [107]
It is most likely Salmonella :)
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3 years ago
The picture below shows a weather station model at a particular location.
g100num [7]

In the given scenario, the weather model is showing light rain, the correct option is B.

<h3>What is a weather station model?</h3>

Current weather circumstances, cloud cover, wind speed, prevailing winds, visibility, heating rate, dew point temperature, atmospheric pressure adjusted to sea level, and pressure change over the last three hours are all depicted in the station model.

As we discovered, the station model is a method of displaying a large amount of weather data on a single area using numbers and symbols.

Meteorologists can quickly glance at the map and see a lot of information this way.

In the given image, the three inverted commas are representing moderate drizzles.

Thus, the correct option is B.

For more details regarding weather model, visit:

brainly.com/question/15792018

#SPJ1

4 0
1 year ago
55:05<br> How does a whale-fall community affect ocean sediment?
eduard

Answer:Whale fall affects ocean deiment because it causes it to move

Explanation:

8 0
3 years ago
Read 2 more answers
write a paragraph explaining why it is difficult to make drugs or vaccines against HIVgiven the fact that each time reverse tran
Sunny_sXe [5.5K]

Answer:

people who are HIV positive but keep the virus in check. This research stems from the International HIV Controllers Study, and researchers hope that their findings will ultimately help inform the development of new therapies and vaccines. Over the last 30 years, scientists have discovered lots of tantalizing clues about the virus, our immune system, and the interplay between the two, but a vaccine remains elusive.

Since the epidemic emerged, 25 million people have died from AIDS and 60 million have been infected with HIV, according to the Joint United Nations Programme on HIV/AIDS. AIDS was detected in California and New York in 1981, first among gay men and drug users, then in hemophiliacs who had received blood transfusions, and later in non-drug-using men, women, and children

Initially, little was known about how AIDS was transmitted, and even less was known about the virus that caused it. In 1985, the virus itself was isolated. Following this discovery, Margaret Heckler, the US Human Services Secretary at that time, famously declared, "We hope to have a vaccine [against AIDS] ready for testing in about two years."

Vaccines have worked well against once widespread diseases like smallpox and polio. After the AIDS virus was found, many people, including many scientists, thought AIDS would be added to the list. Vaccines mimic natural infections, during which the body produces antibodies that kill the virus. But unlike smallpox or polio, HIV doesn’t stimulate this kind of response – our immune systems are generally blind to the virus and unable to launch an effective antibody attack. Other challenges that scientists face as they try to create a vaccine include a lack of good animal models to study and the virus's ability to constantly change and mutate. Additionally, although controllers can keep levels of the virus low, no one has ever fully recovered from HIV infection. This means there's no natural, winning strategy for scientists to study and try to elicit.

Results from previous efforts to build a vaccine have been disappointing. Last year, an HIV vaccine trial in Thailand produced unimpressive results – by some measures, the vaccine reduced the chances of infection by 30 percent at most.

But this summer, scientists discovered three powerful antibodies against HIV and efforts are now underway to transform this discovery into treatment.

In addition to approaches that try to stimulate antibody immunity, researchers are also looking for ways to stimulate cellular immunity, or activate the other weapons in the immune system’s arsenal, like macrophages, natural killer cells, T cells, and more. Alerting the body’s immune system to HIV’s invasion may not prevent infection, but it could inhibit the disease’s progression and keep viral populations so low that there might be less risk of transmission.

One vaccine developed using this approach failed in trials, appearing to even increase some participants' susceptibility to the virus. But knowledge of what happened in that trial may help scientists create a more effective vaccine that targets cellular immunity

By looking at the interaction between the virus and hosts who are able to hold the virus at bay without the help of medicine, researchers hope to learn more about how to fight the virus. New clues from the viral and host genome may help lay a foundation for future means of combating HIV.

Explanation:

4 0
2 years ago
which one of the plants pictured below was given water mixed with salt, and which one was given pure water? Explain how you know
ludmilkaskok [199]

The plant on the right must have been the one given a saltwater mixture while the one on the left must have been given pure water.

<h3>Osmosis</h3>

Looking at the attached image closely, one would see that the plant on the right has withered leaves while the leaves of the plant on the left seem to be flourishing.

The plant on the right must have been the one fed with water mixed with salt and here is the reason. Adding water mixed with salt to the soil on which the plant grows will decrease the water potential of the soil relative to the water potential of the plant's root. Thus, water will move from the plant into the soil through the root by osmosis. This will cause the various cells of the plant to become flaccid, and hence, the withered leaves.

On the contrary, the plant on the left must have been fed with pure water. Feeding the soil with pure water will increase the water potential of the soil relative to the water potential of the plant's root. Thus, water will move from the soil into the plant through the root by osmosis. This will cause the various cells of the plant to become turgid, and hence, the flourishing leaves.

More on osmosis can befound here: brainly.com/question/21395644

#SPJ1

3 0
1 year ago
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