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jeka94
2 years ago
6

Short speech on earth day for Grade 2

Biology
1 answer:
kipiarov [429]2 years ago
5 0

Answer:

Earth is one of the eight planets of our planetary group that rotates around the sun.

Earth is the main known planet that upholds life in the whole planetary group.

World Earth Day is commended on the 22nd of April consistently. It is to increment public attention to the Earth's economical climate.

World Earth Day features the significance of ecological assurance for the endurance of life.

It is accepted that the Earth should be 4.5 billion years of age.

Right around 70% of the outer layer of the Earth is covered with water. Thus, it is known as a blue planet and an extraordinary planet.

Earth has an air holding back 20% of the oxygen that aides in the endurance of living creatures.

Gases like oxygen, carbon dioxide, and nitrogen in the Earth's environment assist plants with developing.

Earth is spheroid in shape. It is critical contrasted with different planets like Mercury, Mars, Neptune, Pluto, and Venus.

Earth finishes its circle around the sun in 365 days. In such a manner, it makes a jump year once in four years.

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Answer:

The answer is <em><u>D. </u></em>

Explanation:

Viruses can evade the processing and presentation of antigens, for example by interfering with the expression of MHC class I proteins, although this increases their susceptibility to be detected by natural killer cells (NK). However, some members of the herpesvirus, papillomavirus, retrovirus, poxvirus and flavivirus families have also developed strategies to escape the attack of NK cells and promote their survival, inhibiting cell apoptosis. Finally, some pathogens often change surface antigens frequently, as in the case of influenza viruses (orthomyxovirus).

The human immunodeficiency virus (HIV) affects CD4 + T cells and degrades the host's ability to counterattack with a strong cell-mediated immune response. There are so many tactics of immune evasion used by HIV, which have so far hindered the development of an effective vaccine.

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3 years ago
What are the characteristics of a multi celled organism
vlabodo [156]

Answer:

Multicellular organisms are made of more than one cell and are complex organisms.

They are visible to the naked eye.

They possess distinct organs and organ systems.

They are eukaryotes, i.e., they contain membrane-bound structures.

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Explanation:

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2 years ago
Which of the following is an example of primary succession?
kiruha [24]

Answer:

B. the appearance of lichens and mosses in an area where a glacier has recently melted away

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Primary succession is a succession that involves an area where no form of life has grown previously, hence, the area of land is barren e.g bare rock. Primary succession is first colonized by species called PIONEER SPECIES e.g. lichens, mosses etc.

According to this question, "the appearance of lichens and mosses (pioneer species) in an area where a glacier has recently melted away" is an example of PRIMARY SUCCESSION.

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3 years ago
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a gated sodium channels open and sodium ions flood into the cell

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