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pashok25 [27]
3 years ago
8

The four principles of natural selection

Biology
1 answer:
natima [27]3 years ago
5 0

1) Variation: there needs to be a difference in the individuals within a population

2) Inheritance: These variable traits must be able to be passed down genetically

3) Growth rate: There needs to be a growth rate that requires a struggle for resources

4) Survival rate: There needs to be a difference in survival rate for the different variation types... certain variations will live

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6 0
2 years ago
Petrolyn motor oil is a combination of natural oil and synthetic oil. It contains 5 liters of natural oil for every 3 liters of
ELEN [110]

Answer:

Total 495 liters of natural oil are needed.

Explanation:

It is given that Petrolyn motor oil is a combination of natural oil and synthetic oil. It contains 5 liters of natural oil for every 3 liters of synthetic oil.

It means the ratio of natural oil and synthetic oil is

\frac{\text{Natural oil}}{\text{Petrolyn motor oil}}=\frac{5}{5+3}=\frac{5}{8}

Let in order to make 792 liters of Petrolyn oil he needs x liters of natural oil.

It means the ratio of natural oil and synthetic oil is

\frac{\text{Natural oil}}{\text{Petrolyn motor oil}}=\frac{x}{792}

Equate both ratios,

\frac{x}{792}=\frac{5}{8}

On cross multiplication we get

8\times x=5\times 792

8x=3960

Divide both sides by 8.

x=\frac{3960}{8}

x=495

Therefore total 495 liters of natural oil are needed.

6 0
3 years ago
The atmosphere of Earth today primarily contains the following gases: carbon dioxide (CO2), water vapor (H2O), nitrogen (N2), an
Anna11 [10]

Answer:

either oxygen or argon, because they are both in the atmosphere

Explanation:

7 0
2 years ago
What is the basic unit of structure and function in living things?
zalisa [80]
The answer is A. a cell
hope it helps!
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3 years ago
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I am The red blood cell
Yuliya22 [10]

Red blood cells, also known as RBCs, red cells, red blood corpuscles, haematids, erythroid cells or erythrocytes, are the most common type of blood cell and the vertebrate's principal means of delivering oxygen to the body tissues—via blood flow through the circulatory system. RBCs take up oxygen in the lungs, or gills of fish, and release it into tissues while squeezing through the body's capillaries.

this is about red blood cells but what are you asking

4 0
3 years ago
Read 2 more answers
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