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3 years ago

Select the correct answer.

Biology

2 answers:

riadik2000 [5.3K]3 years ago

8 0

Answer:

Answer is B.

nitrogen (78.10%), oxygen (20.90%) - this combination of gases dominate the Earth’s atmosphere.

Explanation:

The atmosphere of earth is a gaseous layer which surrounds the earth. It protects the life on earth by absorbing harmful ultraviolet radiation, reducing temperature extremes, maintaining the existence of liquid water on the earth's surface and warming the surface. The atmosphere consists of many gases including some pollutants and greenhouse gases. Nitrogen is the gas present in the atmosphere most abundantly while Oxygen and Argon take the second and third place. Atmosphere contains approximately 78% of nitrogen , 21% of oxygen and 0.9% of argon. Gases like carbon dioxide, nitrous oxides, methane, ozone and the water vapor constitutes the rest of the atmosphere. Many small particles called aerosols are also there which include dust, spores, pollen, volcanic ash, smoke etc. There are five layers of atmosphere. Troposphere (0 to 12 km) where we live is the lowest layer of earth's atmosphere ,which is closest to the earth's surface contains half of the atmosphere. Here most clouds are found and almost all weather occurs. Stratosphere (12 to 50 km) is the second layer where jet aircraft and weather balloons fly. It contains the ozone layer that absorbs harmful radiation from the sun. Mesosphere (50 to 80 km) is the third highest layer and the coldest part of the atmosphere where most meteors burn up upon entering in to the atmosphere. The fourth layer is thermosphere (80 to 700 km) where the International Space Station orbits earth and the space shuttles flew. Exosphere (700 to 10,000 km) is the outermost layer where the atmosphere merges into outer space. Most of the satellites orbiting earth are found here.

jolli1 [7]3 years ago

3 0

Answer:

nitrogen (78.10%), oxygen (20.90%)

Explanation:

100%

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Ad libitum [116K]

Answer:

Bone marrow.

Explanation:

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Thus, the answer is bone marrow.

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3 years ago

In order to carry out the testcross, you should cross your original pea plant with another pea plant whose phenotype is ________

Makovka662 [10]

<span>My pea plant has an unknown genotype for flowers, whether it has two dominant traits for white flowers (WW) or one dominant and one recessive (Ww) leading to white flowers; therefore I am doing a testcross in order to determine the genotype of my pea plant. The best plant to do this with is one that has a phenotype of purple flowers (ww) - that is, it is homozygous for the recessive trait. If I use a homozygous recessive plant, I know exactly what its genotype is. I don't have to worry about whether it's got one or two dominant alleles; I know that at least half of my alleles are going to be the recessive w. This makes identifying the offspring's genotype very simple. If I find that the offspring have at least some purple flowers among them, I know that my original plant had to be Ww; that is it had to have one dominant and one recessive allele for the flower color gene. If, however, all of the offspring are white flowers, I know that my original pea plant had both dominant alleles (WW).</span>

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3 years ago

Leona drew a diagram to compare ginkgoes and conifers. Which characteristic belongs in the area marked X? are deciduous produce

Citrus2011 [14]

The study of plants is called botany. There are different types of plants in the living being and these are algae, bryophytes, pteridophytes, gymnosperm, and angiosperm.

The correct answer is mentioned as follows:-

<h3>GYMNOSPERM</h3>

The less developed plant which does not bear flowers and has covered less seed is called gymnosperm.

According to the question, the diagram is not mentioned in the question hence we can not able to tell the characteristics of the area marked as X. The plants do not look like palm trees.

Hence, provide it with the diagram for better assessment.

For more information about the Gymnosperm, refer to the link:-

brainly.com/question/12985618

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2 years ago

Question 16

Mariulka [41]

Answer:

It stimulates the host cell to produce antiviral toxins, which are released continually into respiratory tract, to destroy the viral cells before they are recognized by the white blood cells.

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3 years ago

a car moves takes fuels and realese energy from gets rids of waste through the exhaust pipe ,is car living things ?explain your

olasank [31]

Answer:No, it cannot do any of the seven things it needs to be able to do to count as being alive such as:

Movement - all living things move, even plants

Respiration - getting energy from food

Sensitivity - detecting changes in the surroundings

Growth - all living things grow

Reproduction - making more living things of the same type

Excretion - getting rid of waste

Nutrition - taking in and using food

The car cannot grow or make baby cars. So a car is not alive.

6 0

3 years ago