1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Stella [2.4K]
3 years ago
10

An Earth scientist is testing how vanous soil mixtures affect plant growth. She begins with 10 soil types. For each mixture, she

combines equal amounts of 2 sod types. How many soil mixtures must the scientist create in order to test all possible combinations of the 10 soil types?​
Biology
1 answer:
nevsk [136]3 years ago
3 0

The correct answer to my knowledge would be 45.

Assuming that the 10 soils are each represented by A, B, C, D, E, F, G, H, I, J.

A can combine with 9 others as: AB AC AD AE A F AG AH AI AJ

B can combine as: BC BD BE BF BG BH BI BJ

C as: CD CE CF CG CH CI CJ

D as: DE DF DG DH DI DJ

E as: EF EG EH EI EJ

F as: FG FH FI FJ

G as: GH GI GJ

H as: HI HJ

I as: IJ

Once you add all the combinations together, you get 45.

Hoping this helped you!

You might be interested in
Cells are placed in a solution that causes them to absorb liquid until they burst. When more water is removed from the solution,
LuckyWell [14K]

Answer:

Cells are placed in a solution that causes them to absorb liquid until they burst. When more water is removed from the solution, newly added cells do not burst. The original solutions was hypertonic solution , while the second was hypotonic solution to the cells.

Explanation:

5 0
3 years ago
What are two ways in which the value of soil can be reduced?
Dovator [93]

Fertile soil is valuable because there is a limited supply. Less than one eighth of land on Earth has soil that are well suited for farming.

The thick, fertile soil of the prairies took many thousands of years to develop.

The two ways that the value of soil can be reduced is help use soil correctly, peanuts were once a corp to help soil, and still can be. The soil value recycle rocks and bedrock.

The value of soil is reduced when it loses its fertility and when topsoil is lost due to erosion. Soil can be conserved through contour plowing, conservation plowing and crop rotation. The thick mass of tough roots at the surface of the soil.

6 0
3 years ago
DHEA is a hormone involved in muscle growth, bone density, and the functioning of the cardiovascular system. DHEA production inc
sertanlavr [38]

Answer:

5%

Explanation:

The adrenal cortex in both males and females produce a small amount of weak androgens. One of the major weak androgen secreted by adrenal cortex is dehydroepiandrosterone (DHEA).

Levels of dehydroepiandrosterone secretion exhibit changes with age. The dehydroepiandrosterone secretion increases till the age of 20-24 years and falls off with increasing age after the age of 30 years in both males and females. The DHEA production at the age of 80 years is about 5% of its secretion at the age of 30 years.

7 0
2 years ago
Which matches mendeleev's prediction for the properties of eka aluminum answers?
alex41 [277]
For the answer to the question above, I think that <span>Mendeleev's eka-aluminum is what we know today as <u><em>GALLIUM</em></u></span><u><em>.</em></u>
or the era of Mendeleev is <u><em>Aluminum</em></u> which is that <span>it would <u><em>be a soft metal with a low melting point.</em></u></span>
I hope my answer helped you. Have a nice day!
<span /><u />
4 0
3 years ago
Read 2 more answers
Describe the relationship between the Sun and Climate Zones.
GalinKa [24]
The main driver of a climate zone is the amount and directness of sunlight that reaches the Earth's surface. In the tropical regions, there is a fairly constant amount of sunlight throughout the year. The maximum sun angle is also higher above the horizon.
6 0
3 years ago
Other questions:
  • Earth has a feedback mechanism that works between the surface of the Earth and its atmosphere. Which of the statements is not co
    9·1 answer
  • Explain how a particular type of stress can cause the extinction of a species.
    7·1 answer
  • The _____ stores glucose as glycogen and converts excess glucose to _____.
    11·2 answers
  • What three different structures form as outpocketings of the diencephalon?
    10·1 answer
  • 2. Which of the following do all animals not need to do in order to survive.
    6·1 answer
  • *PLEASE ANSWER FAST!
    15·2 answers
  • What are the 3 most important parts of a seed
    14·2 answers
  • HELp I will mark brainlyest if correct
    6·2 answers
  • Strong contrasts in texture have what effect on a monochromatic design?
    15·1 answer
  • A genetic word is also known as a
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!