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Goryan [66]
2 years ago
14

What is your body's first line of defense against pathogens? Best guess: White blood cells

Biology
1 answer:
Ostrovityanka [42]2 years ago
4 0


The body's first line of defense is actually the non-specific immune system which is also called innate immunity.

Innate immunity employs  both physical and chemical barriers that form the first line of defense. These include:

1. The intact skin. The skin is made up of keratin  in its outermost  layer. Keratin makes skin tough and resistant and pathogens usually cannot penetrate unless the skin is broken.

2. The mucus membrane. This is a thin membrane that forms a protective lining inside many organs and other parts of the body  such as the trachea. Mucus produced by the membrane traps bacteria and other harmful particle which are then expelled from the body.

3. Tears. Tears from our eyes contain lysozyme, a chemical that kills bacteria.

If the pathogen gets through or evades these types of defenses, then it is dealt with by the second line of defense which is called specific immunity or acquired immunity. It is here that  white blood cells namely the B lymphocytes and T lymphocytes  attack, kill or neutralize pathogens.


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Answer:

1. Another word for chemical weathering is b. disintegration

Chemical weathering is a process by which the rocks are broken down into parts and sediments by the action of a chemical agent such as alkali or acid. The disintegration can be a natural process by which a solid body is broken down into parts or subparts.

2. d. moving water is not an agent of chemical weathering agent.

The chemical weathering can be caused by the agents like lichens which secretes acid on the rock surface and causes it's disintegration, acid rain and salt water are chemical agents that can cause the disintegration of the rock but moving water will have little influence on the hard rock surface.

3. c. chemical weathering is a process which turns rocks and minerals into new substances. The chemical weathering process brings change in the chemical composition of the rocks due to the action of the weathering agents  hence, on disintegration of rocks new substances are formed.

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The steps or parts of a pattern of propaganda include organization, argument, publicity and ______ .
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As propaganda’s purpose is to convince people in something, techniques used for propaganda are founded on psychological research. People who use propaganda use arguments that don’t have to be valid but have to be convincing.

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