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
myrzilka [38]
3 years ago
9

Which of these is NOT one of the structures considered to be the immune system's first line of defense?

Biology
1 answer:
Romashka-Z-Leto [24]3 years ago
6 0

The B cells are not considered as first line defense structures of the immune’s system

Answer: Option C

<u>Explanation:</u>

Our body is protected internally by nature by many layers of defense. Any microbe or a foreign material that disturbs the body is defended by these barriers.

The first layer of defense required physical and chemical barrier such as the skin, mucous membrane, tears, saliva etc . The second line defense system involves the cells and the tissues that protect the body.

You might be interested in
What type of chemical bond if formed when one atom loses an electron and another atom gains an electron ?
tankabanditka [31]

Answer: ionic bond

Explanation: Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.

7 0
3 years ago
Read 2 more answers
An example of a biological event that follows a circadian rhythm is:
nikitadnepr [17]
Sleep is an example. 
Circadian rythms are biological processes that repeats itself within a certain time frame, as sleep repeats itself approximately once every day. 
3 0
3 years ago
The blood cells containing hemoglobin, an iron-containing protein that transports oxygen, are called __________.
Otrada [13]
<span><span>The blood cells containing hemoglobin,  that transports oxygen (O2) to the body tissues of vertebrates, are called red blood cells.</span> Red blood cells (RBCs), are also referred to as red cells, red blood corpuscles, haematids, erythroid cells or erythrocytes<span>, (from Greek erythros for "red" and kytos for "hollow vessel"..RBCs take up oxygen in the lungs and release it into tissues while squeezing through the body's capillaries.</span></span>

<span> </span>

7 0
3 years ago
Which phase of the moon follows the first quarter moon?
kow [346]
This next phase is a Waxing Gibbous. Hope this helps!
3 0
3 years ago
Newborn human babies with lesser body weight are prone to infections. Heavier babies are difficult to deliver through the narrow
Kipish [7]
The answer is (A) stabilizing selection. Stabilizing selection favors the average in a population. In this case, babies that are born at a normal body weight, or an average between the two extremes of underweight and large, tend to have more favorable outcomes.
4 0
3 years ago
Read 2 more answers
Other questions:
  • Are plants autotrophs or heterotrophs? what does this mean?
    15·1 answer
  • Characteristics of the cell wall include which of the following? Select all that apply. cellulose phospholipids and protein incr
    12·2 answers
  • Hemoglobin is a protein that binds to oxygen. It is only produced by red blood cells and it allows blood to transport oxygen thr
    8·1 answer
  • Ozone is know to cause respiratory problems in humans and damage plants. However, the ozone layer provides protection for Earth.
    12·1 answer
  • Tomato plants usually have hairy stems. Hairless stems are present in tomato plants that are homozygous recessive for this trait
    6·1 answer
  • Species A: ATTCGGATTATTCGAGG Species B: GTCCGGTTCATTGGACA Species C: ATCCAGATCGTTCGTGG Which of the following inferences can be
    14·1 answer
  • What is the reason<br> some organisms<br> want to deflect their<br> predators?
    6·2 answers
  • Largest single organ; cleans out poisons in blood and takes vitamins out of the blood
    11·2 answers
  • Little help, please.....
    5·1 answer
  • What’s the answer can someone pleaseeeee helpppp!!!!!!!!!!I’ll mark the brainliest
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!