1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
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.

You might be interested in
Help please I really don’t understand
viva [34]

Answer:

a) proton

b) neutron

c) electron

d) +1

e) nucleus

f) -1

g) atomic number

h) mass number

4 0
3 years ago
Scientists have recently devised a new six-kingdom classification of organisms. According to the cladogram for the six-kingdom s
lisov135 [29]
The six Kingdoms : Plants, Animals, Protists, Fungi, Archaebacteria, and Eubacteria. 

I hope this Helps!
6 0
3 years ago
Read 2 more answers
A second action potential cannot be generated until ________.
Bingel [31]

Answer:

"Action potential is a rapid rise and subsequent fall in voltage or membrane potential across a cellular membrane with a characteristic pattern."

It is the mode through which a neuron transports electrical signals.

Explanation:

  • Option - (a) is the best choice to choose from,
  • <u>The refractory period :</u>

A second action potential cannot occur until the membrane has recovered or reestablished, this is the refractory period. The absolute refractory period coincides with inactivation of voltage-gated sodium channels which makes it impossible to generate another nerve impulse.

5 0
3 years ago
How do volcanoes form at B?
ELEN [110]
That is a subduction or convergent boundary that can form volcanoes when two plates collide against each other.
4 0
3 years ago
Read 2 more answers
I would like this before 11:59 PM EST on Friday, March 26th 2021. Yes, this IS for a HOMEWORK assignment, so PLEASE DON'T DELETE
lapo4ka [179]

Answer:

Minerals can form in all geological environments, which allows them to have a wide range of chemical and physical conditions. Two forms of this are temperature and pressure. There are 4 main categories of mineral formations.   Igneous is where the minerals crystalize from a melt. Sedimentary is where the raw materials of the mineral are particles from other rocks that have suffered from erosion and weathering. Metamorphic is where new minerals are created from earlier ones owing to the effects of change. Most of the time it's from increasing temperature and/or pressure. Hydrothermal is where the minerals are chemically precipitated from hot solutions in the earth.

7 0
2 years ago
Other questions:
  • How are different populations able to live in the same community?
    15·1 answer
  • What type of virus can only infect plants? A) TGEV B) ToMV C) HIV D) H1N1
    13·1 answer
  • When electrons flow along the electron transport chains of mitochondria
    12·1 answer
  • Which is a completely hereditary trait?
    11·2 answers
  • I need help please and thank you
    12·1 answer
  • Which of the following is NOT a function of an antibiotic?
    11·1 answer
  • What 5 types of interacting factors affect the formation of soil?
    11·1 answer
  • Which statement summarizes the changes that occur to energy in cellular respiration
    9·2 answers
  • 100 Points And Brainly If you answer correctly with detail.
    5·1 answer
  • The right optic tract: A. carries information from the lateral halves of both retinae. B. carries information from the medial ha
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!