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Basile [38]
3 years ago
11

When the body is invaded by antigens, the immune system forms substances called?

Biology
1 answer:
Fantom [35]3 years ago
4 0
<span>Antibodies. A. k.a. immunoglobulins. They are produced by a group of white blood cells called B lymphocytes (or B cells). There are 5 classes of immunoglobulins; IgM,IgA,IgE,IgG and IgD.The classes of antibody diifferent both in their constant region and in their activity.IgG, the most common antibody, and is found mostly in the blood and tissue fluids, and IgA is localized in the mucous membranes which line the respiratory and gastrointestinal tracts.</span>
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One of the seed banks has been storing seeds of a rare and endangered plant to keep the seeds fresh.120 of the seeds of this pla
lianna [129]

Answer:

25%

Explanation:

According to this question, a seek stored seeds of a rare and endangered plant. In order to ensure that the seeds remain fresh, 120 seeds are selected to be grown. However, out of these 120 seeds, only 90 germinated. This means that only 90 of 120 seeds are fertile.

This further means that (120-90) = 30 seeds are infertile and hence, could not germinate. In percentage, this can be represented as:

30/120 × 100

= 1/4 × 100

= 100/4

= 25% of the selected seeds are infertile.

5 0
3 years ago
What cycles on earth does Solar radiation fuel?
vodka [1.7K]

Clouds, atmospheric aerosols, snow, ice, sand, ocean surface and even rooftops play a role in deflecting the incoming rays. The remaining 70 percent of solar energy is absorbed by land, ocean, and atmosphere. "Greenhouse gases block about 40 percent of outgoing thermal radiation that emanates from Earth," Woods said.

4 0
3 years ago
Which phrases apply to the formation of tides
tensa zangetsu [6.8K]

Answer:A

Explanation:

This is the answer

3 0
3 years ago
Need answer please fast<br> Amplitude<br> Crest<br> Trough<br> Wavelength
Lina20 [59]
The red line is the wavelength
The blue line is the amplitude
5 0
3 years ago
He portion of the membrane that faces the lumen is called the ________ membrane.
irina1246 [14]

The portion of the membrane that faces the lumen is called the apical membrane.

Membrane is the lipid bilayer that surrounds the cell on its outer surface. The membrane serves various functions like: protection, cell shape and integrity and regulate the traffic of molecules across the membrane. It is semi-permeable in nature.

Lumen is the hollow portion present inside any organ or tube like the artery or intestine. It is a Latin word that means 'an opening'. The lumen of different organs served various purposes. However, the major function is the transport of substances like air, nutrients, waste materials, immune cells, hormones, etc.

To know more about lumen, here

brainly.com/question/28116757

#SPJ4

5 0
1 year ago
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