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Y_Kistochka [10]
2 years ago
6

How were vaccines first discovered?

Biology
1 answer:
BlackZzzverrR [31]2 years ago
7 0

Explanation:

Vaccination is the administration of a vaccine to help the immune system develop protection from a disease. Vaccines contain a microorganism or virus in a weakened, live or killed state, or proteins or toxins from the organism. In stimulating the body's adaptive immunity, they help prevent sickness from an infectious disease. When a sufficiently large percentage of a population has been vaccinated, herd immunity results. Herd immunity protects those who may be immunocompromised and cannot get a vaccine because even a weakened version would harm them.[1] The effectiveness of vaccination has been widely studied and verified.[2][3][4] Vaccination is the most effective method of preventing infectious diseases;[5][6][7][8] widespread immunity due to vaccination is largely responsible for the worldwide eradication of smallpox and the elimination of diseases such as polio and tetanus from much of the world.

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Contact [7]

Answer:

1. B Prokaryotes lack a nucleus and membrane-bound organelles

2. C glucose

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3 years ago
Giving brainly
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Correct answer is ... Seeds have endosperm which provides nourishment for a new plant, but spores do not have any stored food supplies. :)
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What is the correct term for organisms that consume other organisms in order to gain energy and are also known as consumers?
ivann1987 [24]

Answer:

Heterotrophs

Explanation:

A heterotroph is an organism that eats other plants or animals for energy and nutrients.

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3 years ago
Read 2 more answers
What is not a step in most scientific investigations
Mariulka [41]

Question options:

1. developing a hypothesis to explain collected data

2. proving a theory and writing a new scientific law  

3. collecting data through observation and measurement

4. observing and experimenting to test a hypothesis

Answer:

2. proving a theory and writing a new scientific law  

Explanation:

Providing a theory and write a new scientific law is not a step of scientific investigation. To prove a law a theory, its take many years of research.

There are steps of scientific investigations below,

1. Make an Observation.

2. Form a Question.

3. Form a Hypothesis.

4. Conduct an Experiment.

5. Analyze the Data and

6. Draw a Conclusion.

These step of scientific investigation does not include to write a theory and scientific law.

4 0
3 years ago
Which one of the "big 3" macronutrients is the most calorically dense at 9 calories per gram?
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<span>Fat is by far the most calorie loaded of the macronutrients, containing 9 calories per gram compared to only 4 calories per gram for proteins and carbohydrates. Although a low fat diet is generally desirable for persons who would like to restrict their caloric intake, a no fat diet is no recommended by nutritionists or doctors since there is a dietary need for some fat in the diet.</span>
7 0
3 years ago
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