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
Schach [20]
3 years ago
15

Which statement describes many of the structures involved in the first line of defense of the immune system? They have contact w

ith the external environment. They are internal and contact the pathogen through blood. They produce B-cells in response to a pathogen. They produce T-cells in response to a pathogen.
Biology
2 answers:
Strike441 [17]3 years ago
6 0

Answer:

The correct answer would be They have contact with the external environment.  

The first line of defense refers to the outside defense system which consists of physical and chemical barriers.

They have contact with the external environment and help in preventing the entry of the infectious agent in the body.

They include skin, mucous membranes and their secretions such as tears, stomach acid, urine flow, et cetera.

cricket20 [7]3 years ago
4 0
They have contact with the external environment.
You might be interested in
Plants are unique because they have<br> which absorb licht energy from the sin
qwelly [4]

Answer & Explanation:

Plants are unique because they have chloroplasts, which absorb light energy from the Sun.

-Hope it helps!

。◕‿◕。

5 0
2 years ago
Which matter exists in the liquid state at room temperature?
Ronch [10]

B) honey

A shirt is a solid, and helium is a gas at room temperature. A nebula is... not an object.

5 0
2 years ago
Read 2 more answers
When the quadriceps contact what also must happen at the same time?
Inessa [10]

Answer:

B. The hamstrings must relax.

Explanation:

When the quadriceps contact, the hamstrings must relax at the same time.

8 0
3 years ago
What happens if the cells in clean meat are not balanced (will give Brainlyest)
Rom4ik [11]
I think that’s right thanks for the point god bless
7 0
3 years ago
Although many organisms (including eukaryotes) use the Embden-Meyerhof-Parnas (EMP) pathway for the initial catabolism of glucos
tankabanditka [31]

Answer:

<h2>Reduced ability to colonize the mammalian gut.</h2>

Explanation:

The Entner-Doudoroff Pathway (ED Pathway) is a metabolic pathway that is most notably in Gram-negative bacteria, some + bacteria and archaea. Glucose is the starting molecuke in the ED pathway and through a series of enzyme assisted chemical reactions it is catabolized into pyruvate.

Those mutants of E. coli lacking a key enzyme in Entner-Doudoroff  (ED Pathway)Pathway leads to reduced ability to colonize the mammalian gut.

3 0
3 years ago
Other questions:
  • What happens with insecticides and herbicides that we put on our lawns?
    6·2 answers
  • Can anyone help me with this
    14·2 answers
  • Concerning the planetary orbits, why was Copernicus somewhat inaccurate?
    6·1 answer
  • What are cells made up of​
    13·1 answer
  • Those who have positive qualities are often judged more positively on their other qualities.
    7·2 answers
  • Which human activity increases beach erosion
    7·2 answers
  • True or False: Grizzly Bears and Polar Bears are the same species.
    7·2 answers
  • Can science be ethical if the scientists conducting the work are not ethical? How would
    6·1 answer
  • 1 point
    7·1 answer
  • Which of the following sentences best describes osmosis?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!