White Blood Cells (WBC), produced by the stem cells found in the bone marrow, manufacture antibodies used to counter the effects of the antigens.
The White Blood Cells are known to provide immunity to the body against foreign bodies like bacteria, virus, proteins, etc. The lymphocyte cells, namely, the B-cells and T-cells are the two key cells that make antibodies for various antigens and kill or lyse the foreign body by recognising the antibiotic marker attach to them.
Answer:
i giess its ans is option b
<span>Something that occurs outside the spheres of the earth
Consider that human beings or living organisms live in the biosphere. Biosphere is the collective group of living organisms and their interaction to one another and –ecosystem- to their environment. Human beings like animals or plants are part of the biosphere, one of the spheres in the earth. We have the atmosphere (air), lithosphere (land), hydrosphere (water) and the biosphere (life/ living organisms). Each is with a specific and distinctive characteristics to play in the earth’s existence at the current era.<span>
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<h3><u>
The following events are identified as chemical weathering:</u></h3>
- The minerals in a marble statue react with water to form acids and pores in the structure.
- The rocks in a region are streaked orange after being exposed to repeated rains.
<em><u>Reason: </u></em>
When the weathering process occurs due to <em>chemical reaction</em>, then it is considered as chemical weathering.
In <em>the first case</em>, minerals of marble statue are <em>reacting</em> with water to cause weathering. In the <em>second case</em>, due to the <em>acidificaion reaction</em>, the change of the color has happened after exposure to the repeated rains.
<h3><u>
The following events are identified as Mechanical weathering:</u></h3>
- A piece of rock crumbles after being constantly thrashed by strong waves.
- Industrial runoff forms cracks in a rocky structure in its path.
<em><u>Reason:</u></em>
When the rock is broken into simple pieces <em>without any chemical reaction </em>it is considered as mechanical weathering.
In the <em>first cause</em>, due to the <em>abrasion</em> caused by the strong waves, weathering has happened, in the <em>second case</em> industrial run off may be of varying temperature and thus may cause <em>heating or cooling</em> of the rock and causes weathering.
Answer: A sum total of all living and non-living elements and their effects which influence human life is known as environment. An environmental aspect is an element of an organization's activities, products, and services that can interact with the environment. These can include discharges to water, emissions to air, waste and use of natural resources and materials.
2.Answer: 1.
Environment plays an important role in healthy living and the existence of life on planet earth.
2. Earth is a home for different living species and we all are dependent on the environment for food, air, water, and other needs.
3.Everything that surrounds us constitutes our environment. .
4. The environment plays an important role in the healthy living of human beings.
