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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.

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You are observing a tissue under the microscope and see long, cylindrical, striated, multinucleate cells, arranged parallel to e
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The tissue is identified as skeletal muscle tissues. These muscle tissues are long, cylindrical, striated, multi nucleate cells and are arranged parallel to each other

Skeletal muscle is one of three major muscle types other than the cardiac and smooth muscle. Most skeletal muscles are attached to bones by bundles of collagen fibers known as tendons.

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3 years ago
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On topographic maps, how does the spacing of contour lines relate to continental and ocean-floor topography? A. For both contine
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For both continental and ocean-floor topography, gentler slopes are represented by widely spaced lines while steeper slopes are represented by closely spaced lines.

Explanation:

The contour lines are one of the main, and one of the most used methods on the maps for representing the topography. Basically, the contour lines are closed lines that connect dots on the same elevation. It may sound very simple, but they do provide good insight into the topography, especially if the reader of the map knows how to interpret them well.

The contour lines are used both for continental and ocean-floor topography. The rules are the same for both, including the representation of the slopes. When a slope is gentler, the contour lines are more widely spaced. When a slope is steeper, the contour lines are much more closely spaced.

Some elements of the contour lines or that go with them to give better representation are:

  • black dots (representing a top)
  • thicker lines (every fifth, so that the counting is faster and easier)
  • small lines with given direction (representing cliffs or highly steep slopes)
  • numbers (providing information about elevation)

Learn more about contour lines brainly.com/question/1972242

#learnwithBrainly

4 0
3 years ago
When reproducing a plant by _____, you can use the stem, root, or leaf.
ankoles [38]

Answer:

when reproducing a plant by ____, you can use the stem, root, or leaf.

Explanation:

* cutting

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Select all that apply.
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Genetic variation occurs.
Mutations are not copied over and over again.
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In the hardy-weinberg equations, the frequencies of 2 alleles in a population (where there are only 2 alleles to consider) can b
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2 allele frequency is designated p and q
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