BIOLOGY HIGH SCHOOL

The kidneys prevent your ___ from becoming contaminated with waste.blood
liver
stomach
lungs

Answers

Answer 1
Answer: blood is correct answer
Answer 2
Answer:

Answer:

I WOULD SAY

A: BLOOD

IS THE ANSWER

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The leaves of a plant appear to be green because light waves areA. reflected
b. absorbed
c. both absorb and reflected
d. neither absorb or reflected

Answers

i believe a reflected , because green light is not absorbed but reflected .

Answer:

La respuesta es la B /The answer is B

Explanation:

La clorofila, el pigmento que hace que las hojas sean verdes, absorbe luz en las longitudes de onda violeta y azul y asimismo en el rojo; dado que refleja la luz verde, parece verde.

Chlorophyll, the pigment that makes the leaves green, absorbs light in the violet and blue wavelengths and also in the red; Since it reflects green light, it looks green.

Identify the values of x and y that would make the following expression represent a real number.(4 + 5i)(x + yi)

A. x = 4, y = 5
B. x = –4, y = 0
C. x = 4, y = –5
D. x = 0, y = 5

Answers

I think the correct answer from the choices listed above is option C. The values of x and y that would make the expression to represent a real number would be that  x = 4, y = –5. Substituting and simplifying,

(4 + 5i)(4 - 5i)
16 - 20i + 20i - 25i²
16 - 25(-1)
16 +25
41

x = 4, y = -5

Further explanation

This is a problem with complex numbers.

A complex number is a number of the form \boxed{ \ z = x + yi \ } where x and y are both real  numbers.

  • x is considered the real part of the complex  number.
  • y is considered the imaginary part of the complex  number.
  • The real part of a complex number \boxed{ \ z = x + yi \ } is denoted by \boxed{ \ Re(z) \ }.
  • The imaginary part of a complex number is denoted by \boxed{ \ Im(z) \ }.
  • The modulus of a complex number \boxed{ \ z = x + yi \ } is denoted by \boxed{ \ |z| \ } and defined to  be \boxed{ \ |z| = √(x^2 + y^2) \ }
  • Remember this \boxed{ \ i^2 = (√(-1))^2 = -1 \ }

For example, \boxed{ \ z = 3 - 4i \ }

  • Re(z) = 3
  • Im(z) = -4
  • The modulus \boxed{ \ |z| = √(3^2 + (-4)^2) = 5 \ }  

Let's look at the key problem.

We must identify the values of x and y that would make the following expression represent a real number.

\boxed{ \ = (4 + 5i)(x + yi) \ }

\boxed{ \ = 4(x + yi) + 5i(x + yi) \ }

\boxed{ \ = 4x + 4yi + 5xi + 5yi^2 \ }

\boxed{ \ = 4x + 4yi + 5xi - 5y \ }

At this point, 4yi and 5xi must be of equal value and marked opposite, so that the expression represents real numbers.

\boxed{ \ 4y = - 5x \ }

Become a fraction, i.e.,

\boxed{ \ (x)/(y) = (-4)/(5) \ or (x)/(y) = (4)/(-5) \ }

From the options, the answer is C.

\boxed{ \ x = 4, y = -5 \ }

- - - - - - -

Let's check back to expression.

\boxed{ \ = (4 + 5i)(x + yi) \ }

\boxed{ \ = 4x + 4yi + 5xi - 5y \ }

x = 4 dan y = - 5 ⇒ \boxed{ \ = 4(4) + 4(-5)i + 5(4)i - 5(-5) \ }

\boxed{ \ = 16 + -20i + 20i + 25 \ }

\boxed{ \ = 16 + 25 \ }

\boxed{ \ = 16 + 25 \ }

Thus the expression represent a real number of 41.

Learn more

  1. The midpoint brainly.com/question/3269852
  2. The piecewise-defined functions brainly.com/question/9590016
  3. The composite function brainly.com/question/1691598

Keywords: identify, the values of x and y, the following expression, represent a real number, (4 + 5i)(x + yi), a complex number, real, imaginary

_______ is (are) associated with 85% of the cases of threatened and endangered species.

Answers

Hello. I do believe that the response to that problem or query would be that of global warming.

A father with type B blood and mother with type A blood have a child. Their child, while in a biology lab at school, tests her blood and discovers she has type O blood. Does she have any concerns about her parentage?A. Yes, because she should have type AB blood if they are her true biological parents.
B. No, because type O blood is possible if her parents both had genotypes AB.
C. No, because both of her parents could be heterozygous.
D. Yes, because both of her parents might be heterozygous.
E. No, because blood types A and B are codominant.

Answers

C. you can have an A or B blood type but also have recessive genes that could give an O if parent were heterozygous, like if the mother was A-i (i being recessive gene that could give 'O') and the father was B-i then if you do a punnett square then you can see that there's a 25% chance she has i-i or type O blood. 
C. if the father was B, the mother was A, and the child had O, then the father had to be Bi and the mother had to be Ai

The Earth is a unique planet in that it is covered by more than 70 percent water. There are several properties of water that make Earth a suitable environment for life, including how the density of solid water (ice) is about nine percent less than the density of liquid water. Which best explains why this feature of water is important for marine life?Ice forms from the bottom of the water column up, allowing organisms to freeze and enter hibernation.

Ice forms from the top of the water column down, creating a protective barrier over the liquid water.

The higher-density liquid water shelters organisms from cold air better than the less-dense ice.

The higher-density liquid water traps nutrients for primary producers better than the less-dense ice.

Answers

Answer:

The higher-density liquid water shelters organisms from cold air better than the less-dense ice.

Explanation:

    Because of this difference in density, the waters of lakes and seas do not freeze completely because a less dense ice layer forms on the surface and creates a natural thermal insulator that makes the water below it remain in the liquid phase. This saves the animal and plant life of lakes and seas.

    Ice works as a thermal insulator because its specific heat (2.03 J/g. ºC) is lower than that of water (4.18 J/g. ºC).

    After the cold is over and the hot season comes, the surface ice melts easily. But that would not happen if the ice dropped to the bottom of lakes and seas. With this, the animal and plant life would be compromised.

    Another important point is that, as already mentioned, liquid water reaches its maximum density at approximately 4ºC, which is 1,000 g/cm3. Therefore, during times such as spring and fall, the water reaches temperatures near this and becomes denser than the rest, going to the bottom. This causes a vertical movement called the convection current, which is responsible for mixing the nutrients dissolved in water.

The higher-density liquid water shelters organisms from cold air better than the less-dense ice.

When an object is burning, two atoms of oxygen (in the air) combine with one atom of carbon (from thesubstance burning). This forms carbon dioxide gas. Explain how the law of conservation of matter applies to

this reaction.

2. A piece of wood is burned, and a small amount of ashes are formed. Explain why the original piece of wood

and the resulting ashes will not weigh the same.

Answers

1. The law of conservation of mass applies to this reaction because when you look at its balanced chemical equation, the same amount or ratio of elements can be found:

C + O2 --> CO2

This shows that the product will have the same ratio of reactants.

2. The original piece of wood and resulting ashes do not weight the same because the combustible parts of the wood were burned and converted to gases. This means that the missing mass is equal to the gases produced. The remaining ashes are the incombustible parts of the wood.
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