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
masya89 [10]
3 years ago
8

The auditory, or eustachian, tube extends from the nasopharynx to theA external ear.B middle ear.C inner ear.D oropharynx.

Biology
1 answer:
Nikolay [14]3 years ago
7 0

Answer:

Option B, Middle ear

Explanation:

Nasopharynx is the upper part of throat which lies behind the nose and it connects the to middle ear. It moves the mucus produced in the middle ear to the throat which is then further drained out.

This tube is responsible for equalizing the pressure inside the ear to the pressure outside the ear. It comprises upper throat and rear side of nasal cavity.

Hence, option B is correct

You might be interested in
Describe the beneficial uses of bacterial toxins in medicine.
worty [1.4K]
The beneficial uses of bacterial toxins in medicine are more and more used lately. For example, Botulinum toxin is a toxic protein produced by the bacterium Clostridium botulinum which has paralytic effects (injection of this toxin into muscle relax specific muscles). Botulinum toxin accomplishes his effects on the neuromuscular junction where he prevents the release of the neurotransmitter acetylcholine (Ach). Utilization of this toxin is in the treatment of various muscle spasms. It is also used in the treatment of migraines. Diphtheria toxin is also one of the toxins used for medical purposes for the treatment of cutaneous and non-Hodgkin T-cell lymphomas. <span>Some bacterial toxins can be used in the treatment of tumours. For example, immunotoxin, which is protein made by fusion of modified antibody and toxin.The antibody binds to an antigen on the target cell, the toxin then enters via endocytosis and kills the cell. Commonly used bacterial toxins in immunotoxins are Diphtheria toxin and the Pseudomonas exotoxin.</span>
3 0
3 years ago
Which element is a metaloid
Studentka2010 [4]

Answer:

Elements that are the border line of metals and non-metals.some elements near the stepped line have mixed properties of metals and non-metals these elements are called metalloid e.g. Silicon and Germanium

Explanation:

I hope this will help you:)

3 0
3 years ago
15 points for this! Thank You
zalisa [80]
Well, I don’t know the question but I believe that John is correct but they would have to have to be strong stilts
3 0
3 years ago
This organism must consume other organisms to obtain its energy
Tomtit [17]

Answer: consumer

Explanation:

5 0
3 years ago
Read 2 more answers
4. Which is a
irina1246 [14]

Answer:

3. Rise in sea level

Explanation:

As the glaciers melt the water from the melted glaciers causes the sea to rise since more water is being added. Not answer 1 or 2 because ice melts as it gets warmer.

4 0
2 years ago
Other questions:
  • Which organisms would weather the rock to
    11·1 answer
  • In which phase of mitosis are the chromosomes completely separated and the nuclear membranes begin to be rebuilt?
    10·1 answer
  • What areas of the body are involved in the lymphatic system and how do they work?
    12·1 answer
  • What type of organisms undergo alcoholic fermentation?<br>​
    9·1 answer
  • Select all that apply. What are the nutrients needed for good health? proteins sugars carbohydrates vitamins minerals lipids
    9·2 answers
  • Albumin is a protein found in egg whites.
    10·1 answer
  • What would most likely happen to life on Earth if the carbon cycle stopped? Life would continue unchanged. Life would cease to e
    12·2 answers
  • C6H12O6 + O2 → 6 CO2 + 6 H2O
    8·1 answer
  • What is an example of chemical weathering, as opposed to mechanical weathering?
    6·2 answers
  • Which of the following is an abiotic factor in an ecosystem?
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!