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GREYUIT [131]
3 years ago
7

What must happen before a cell can begin mitosis??

Biology
1 answer:
ss7ja [257]3 years ago
7 0
Answer - The chromosomes has to be crucially duplicated and it happens actively during the resting phase or interphase.

Reasoning - During the resting phase or interphase you call it, Is important to have the same exact DNA or Chromosomes to be duplicated. If the chromosomes did not duplicate during the interphase then the split of the cell would be unbalance and uneven and likely to cause defects.

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5. When a hawk eats a mouse and then uses the energy from the mouse to fly,
mafiozo [28]

Answer:

Chemical To Mechanical

Explanation:

The Chemical energy fueled the hawk and the hawk used that energy to fly, basically like a car needs gasoline to move

5 0
3 years ago
Where do the branches of the bronchial tree ultimately end? 2. list the steps of the pulmonary circuit of the cardiovascular sys
Aneli [31]
1. The branches of the bronchial tree ultimately ends at the alveoli.
Bronchial tree consist of bronchi, bronchioles, and alveoli. Bronchi are formed as the lower part of the trachea divides into two tubes. Bronchioles are smaller tube divisions of the bronchi. It walls contain smooth muscle and no cartilage. Alveoli are tiny ends of the alveolar ducts, which functions as the site for gaseous exchange. 

2. Blood flows from the left atrium; mitral (bicuspid valves), the left ventricle, aortic valve, aorta, veins and heart, right side of the heart, superior and inferior vena cavae, right atrium, tricuspid valve, right ventricle, pulmonary valve, pulmonary trunk, pulmonary artery, lungs, pulmonary veins, then back to the heart...

3. Arteries and the veins differ in structures and they way they functions; Arteries carry oxygenated blood away from the heart to the body (except pulmonary artery) while veins carry deoxygenated blood back from the body to the heart (except pulmonary veins). A structural differences includes; the veins contain valves while arteries lack. Arteries have narrow lumen while veins have wide lumen. Lastly, blood carried by veins has higher pressure compared to blood carried in vessels.

4. The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and the bronchioles. Blood moves in and out of the lungs throgh the pulmonary arteries and veins that connect to the heart.

5. The cartilage rings of the trachea
They are strong but flexible tissues which support the trachea or the windpipe while still allowing it to move and flex during breathing. Additionally these cartilage rings are C-shaped to provide room for the esophagus, which lies along the back side of the trachea.

6. Functions of the larynx includes;
To protect the airway from choking on material in the throat
to regulate the flow of air into our lungs
The production of sounds used for speech 
Larynx is part of the respiratory system and is located between the pharynx and the trachea. Humans use larynx to breathe, talk and swallow. 

7. Structures that make up the pathway of air through the respiratory system starting with the external nares; We start with; External nares, nasal cavity, internal nares, nasopharynx, laryngopharynx,oropharynx, larynx, trachea, primary bronchus, secondary bronchus, tertiary bronchus, bronchiole, terminal bronchiole, respiratory bronchiole, alveolar duct, alveolar sac and alveolus. 
6 0
3 years ago
List the 9 main types of evidence that is compelling for rapid climate change
barxatty [35]

Answer:I got it

Explanation:

Carbon Dioxide Concentrations in the Atmosphere Are Increasing

Global Temperature Rise

Shrinking Ice Sheets

Warming Oceans

Glacial Retreat

Decreased Snow Cover

Sea Level Rise

Declining Arctic Sea Ice

Ocean Acidification

5 0
3 years ago
Crick et al found that not all combinations of (+) and (-) frameshift mutations results in suppression and an rII+ phenotype. Wh
GenaCL600 [577]

Answer:

d. Two of the above explanations are correct.

Explanation:

A frameshift mutation is commonly known as a genetic mutation that occurs as a result of the indels such as the addition or removal of certain nucleotides in the sequence of a DNA that is indivisible by three. In the presence of addition or removal, the reading frame from the initial translation to a different one. Thus, the correct option is option d.

5 0
3 years ago
What is meant by the statement ""enzymes are biological catalysts""?.
Lesechka [4]

Answer:

Enzymes speed up the chemical reactions in living cells.

Explanation:

An enzyme is a biological catalyst and is almost always a protein. It speeds up the rate of a specific chemical reaction in the cell. The enzyme is not destroyed during the reaction and is used over and over.

8 0
2 years ago
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