Which best describes the age structure of a population with zero population growth?4 The majority of people are of prereproductive ages in a broad-base pyramid age structure diagram.

The age-structure diagram would be narrow at the bottom and top with a broader middle.

The age structure would be broad at the top in postreproductive ages and narrow downward in an inverted pyramid.

The age-structure diagram would be column-shaped with all age classes approximately equal.

Answer: B cells can be influenced by genetic factors

Explanation: Daren has sickle cell disease. Sickle cell disorder is a kind of disease that affects the hemoglobin in the red blood cells. Hemoglobin, is a molecule in red blood cells that delivers oxygen to cells throughout the body. People with Sickle cell disorder have hemoglobin molecules called hemoglobin S, which distort the shape of the red blood cells. A normal red blood cell has a disc shape but people with sickle cell like Daren have their red blood cells and distorted into a sickle, or crescent, shape

The approximate composition of the atmosphere is shown in the pie-chart shows the percentages of pure substances in a mixture.

Atmosphere:

It is a mixture of different gases around the earth. This includes Nitrogen, Oxygen, Carbon dioxide etc.

• The constituent gases are not just elements some are compounds also such as Carbon dioxide.

• Atmosphere is the mixture of gases.

Hence, options A, B, and D are incorrect.

Therefore, the approximate composition of the atmosphere is shown in the pie-chart shows the percentages of pure substances in a mixture.

To know more about Atmosphere,

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The pie chart is missing but going with how the atmospheric composition pie chart looks like in general:

A is wrong as some gases such as moisture and carbon dioxide are not elements.

B is wrong as air is not a compound.

D is wrong as air is not a pure substance.

The only answer left is C)  The chart shows the percentages of pure substances in a mixture.

Answer:

1. The equations are

2. we can use elimination method to solve the problem

3. She has 50 5$ bills and 30 10 $ bills

4. The values of x and y that we found satisfies the two equations which ensures that the solution is correct.

5. Elimination method involves lesser number of steps when compared with graphical method and substitution method.

Explanation:

Number of 5$ bills=x

Number of 10$ bills=y

Total number of bills=80

total amount=$550

Here we have two equations and we can use elimination method to solve the set of equations

   (Equation 1)

   (Equation 2)

We have to make the coefficient of one variable in both equations same.

Let us make the coefficient of x same.

  (Equation 3)

Subtract (3)from (2)

Substitute the value of y in equation (1)

x=50

y=30

Answer:

Answer is in the explanation.

Explanation:

Let's make a system of equations.

5x+10y=550

x+y=80

Now let's use elimination

-5x-5y=-400

5x+10y=550

__________

5y=150

y=30

Then subsitute 30 in for y to find x. This will leave you with x=50. You will have 50 $5 bills and 30 $10 bills. You can check by subsituting x for 50 and y for 30 in both equations to show why it is correct. Eliminating makes it easier to solve the system of equations.

Answer: B) The membrane is permeable to the solvent and dialysate, but not to the protein.  

Explanation:

Answer:  B) The membrane is permeable to the solvent and dialysate, but not to the protein.  

Explanation:

the molecules will eventually reach equilibrium due to the concentrations on each side of the membrane and the water potential of the solution inside and outside of the dialysis bag. The proteins cannot move through the membrane, and therefore stay in the dialysis bag.

occurring continuously over a period of time.