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Karo-lina-s [1.5K]
2 years ago
9

Dr. Jones says an atom has 3 electrons in the first shell and four electrons in the second shell. Someone should tell Dr. Jones

that...
A) the second shell should have 8 electrons.
B) the second shell can't have 4 electrons.
C) no shell can hold more than 2 electrons.
D) the first shell must fill before the second shell can have electrons.
the first shell shouldn't have 3 electrons.
Biology
1 answer:
aksik [14]2 years ago
8 0

Answer:

D) the first shell must fill before the second shell can have electrons.

the first shell shouldn't have 3 electrons.

hope this helps! <3

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A woman consumes 500 grams of carbohydrates, 30 grams of protein, and 75 grams of fat in one day. how many total kcalories has s
DedPeter [7]
To calculate the energy offered from food, multiply the number of grams of protein, carbohydrate, and fat by 4, 4, and 9, respectively.
Then add the results together.

Given: 500 grams of carbohydrates, 30 grams of protein, and 75 grams of fat in one day.

500 grams x 4 kcal/g = 2000 kcal
30 grams x 4 kcal/g = 120 kcal
75 grams x 9 kcal/g = 675 kcal
= 2795 kcal

From this data, you can calculate the percentage of k calories each of the energy nutrients give to the total.
Solution:

2000/2795 * 100% = 72% from carbohydrates
120/2795 * 100% = 4% from protein
675/2795 * 100% = 24% from fat
Total: 100%
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Pulling away from a painful stimulus is an example of a(n) ________ reflex.
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It is an example of a withdrawal reflex.
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Which of these essential elements is it most likely to be toxic to plants in a soil at pH 4.0?
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The autorhythmicity of cardiac pacemaker cells is made possible by the reduced permeability of _______. The autorhythmicity of c
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Answer:

<h2>potassium</h2>

Explanation:

The heartbeats of the heart are controlled by the sinoatrial node also known as the pacemaker of the heart. The impulse is generated in the conducting cells of the pacemaker as a result of the movement of sodium, potassium and calcium ions.

The sodium channels allow the movement of sodium into the cell which depolarizes the membrane from -60mv to -40 mv. At this point, the calcium gated channels open which allow the entry of the calcium in the cell which depolarizes the cell up to +5mv.

At this point, the potassium channels open which allows the potassium ions to move out of the cell. This repolarizes the cell and hence the cycle again begins.  Reducing the permeability of the potassium ions help generate the autorhythmicity due to repolarization and thus is the correct answer.

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