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3 years ago

How does the nitrogen cycle effect humans?

1 answer:

7 0

Answer: Researchers/scientists have decided that people are disturbing the nitrogen cycle by modifying the sum of nitrogen that's put away within the biosphere.

Explanation: Can I have brainliest?

Have a nice day c:

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UkoKoshka [18]

The correct answers are dogs and daisies.

Cell differentiation is the phenomenon in which a simple cell changes into more complex form. It is a kind of developmental biology. Differentiation occurs many times in the whole developmental procedure. It occurs in the eukaryotic multicellular organism. Example: A single cell zygote of a multicellular organism differentiates into different types of cells to form complex organism.

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3 years ago

Read 2 more answers

Water has the ability to dissolve salts and carry dissolved carbon dioxide. how does this action help the human body maintain ho

zhuklara [117]

Homoeostasis is a system of maintaining balance. This is important because too much salt and the body can develop problems like high blood pressure, and edema. This increases the risk of a heart attack, strokes, dementia, and kidney disease. Then the dissolved carbon is unnecessary to the body.

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3 years ago

Read 2 more answers

Why are antibiotics ineffective against viruses?

vagabundo [1.1K]

Answer:

antibiotics are useless against viral infections this is because viruses are so simple that they use their host cells to perform their activities for them. so antiviral drugs work differently to antibiotics by interfering with the viral enzymes instead

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3 years ago

If the a and b loci are 20 m.u. apart in humans and an A B/ a b woman mates with an a b/ a b man, what is the probability that t

Elanso [62]

Answer:

The probability of having a Ab/ab child is 10%

Explanation:

The genes A/a and B/b are linked and 20 m.u. apart.

The parental cross is:

Gametes:

The man only produces 1 type of gametes, so the probability of him producing an ab gamete is 1.

The woman produces 4: two parental (AB and ab) and two recombinant (Ab, aB).

Man: ab

Woman: AB, ab, Ab, aB

The formula to relate genetic distance with recombination frequency is:

Genetic Distance (m.u.)= Recombination Frequency X 100.

Replacing the data in the formula, we have:

20 m.u. / 100 = Recombination Frequency

0.2 = Recombination Frequency

Because the Recombination Frequency is 0.2, the woman will generate recombinant gametes 20% of times, and parental gametes the other 80%. Each recombinant gamete will appear in 10% of the cases, and each parental gamete will appear in 40% of the cases.

The probailities for each possible genotype of the progeny resulting from that cross will be:

Parental: AB/ab 40%

Parental: ab/ab 40%

Recombinant: Ab/ab 10%

Recombinant: aB/ab 10%

7 0

4 years ago

Match the following: 1. the continuous movement of water between the Earth's surface and the atmosphere lead 2. pollutes water s

Nat2105 [25]

Answer:

Explanation:

1. Hydrological cycle: the continuous movement of water between the Earth's surface and the atmosphere.

2. Industry: pollutes water sources by dumping wastes in rivers, streams, and oceans.

3. Sewage: the leading cause of water contamination in countries without water treatment plants.

4. Agriculture: a source of water pollution caused by the overuse of pesticides and fertilizers.

5. Eutrophication: caused by an overabundance of organic matter in water supplies.

6. Putrefaction: the decomposition of organic matter by microorganisms

7. Pesticides: a chemical pollutant that can enter the water cycle through agricultural or domestic use.

8. Petroleum: can cause the contamination of underground water supplies if poured on the ground

9. Lead: a metal that leaks into water supplies via the soil or aging water systems.

10. Humoral immunity: depends upon the production of disease-specific antibodies to destroy harmful bacteria.

11. Stimulants: increases the activity of the central nervous system.

12. Depressants: reduces the activity of the central nervous system.

13. Bacterial infection: caused by the reproduction of a small infectious agent, which produces poisons that destroy cells

3 0

3 years ago