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BabaBlast [244]
4 years ago
9

What age do boys mature

Biology
2 answers:
Oxana [17]4 years ago
7 0
Boys mature at age 12
Katen [24]4 years ago
5 0
In boys, puberty begins around 12 years as age, but may start as early as 9 years of age.
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The rise in manufacturing beginning in the early 1800s eventually resulted in __________ by 1848?
mamaluj [8]

Answer:

The correct answer is "The emergence of a larger middle class in the North".

Explanation:

The missing options of this question are:

A) The emergence of a larger middle class in the North

B) A decline in economic inequality in urban areas

C) An increased demand for agricultural workers in the Midwest

D) The improvement of working conditions in factories

The correct answer is "The emergence of a larger middle class in the North"

The period of 1800 to 1848 is characterized by being of economical growth due to the rise in manufacturing technology. Result of this economical growth, many families improve their economical conditions and by 1848 a larger middle class emerged in the North. However, eventually a laboring poor population started to growth as well.

6 0
3 years ago
Which of These is a exoskeleton<br><br> A. Deer<br><br> B. crab<br><br> C. tree<br><br> D. elephant
Bogdan [553]
B. Crab

is your answer

An crab has an exoskeleton

hope this helps
7 0
4 years ago
1. How many pounds of biological material is below that soil surface?​
Stella [2.4K]

Answer:

The amount of organic matter in mineral (sand, loam or clay) soils ranges from very low being 1% by weight, to average being 2 to 4%, and high being greater than 5%. There are also “muck” or organic or peat based soils that are 30 to 40% organic matter. The general consensus is the more soil organic matter the better.   approximately 45%

Soil Composition

The basic components of soil are minerals, organic matter, water and air. The typical soil consists of approximately 45% mineral, 5% organic matter, 20-30% water, and 20-30% air. These percentages are only generalizations at best.

Explanation:

8 0
3 years ago
What are food,water,living space and disease examples of
____ [38]

Hello there,

Food,water,living space and disease examples of <u><em>The density dependent factors.</em></u>

Hope this helps!!!!

4 0
3 years ago
An important condition for the formation of coal is ________.
Anastasy [175]

Answer:

Incomplete decomposition of organic matter due to a lack of oxygen. (Ans D).

Explanation:

Coal is known as the mostly carbon with containing different amounts of oxygen, nitrogen, sulfur, and hydrogen. Coal is formed when Incomplete decomposition of dead plant matter due to a lack of oxygen occurs. In-plant matter because of the pressure, and heat-generating physical, and chemical changes occur which lead to force out oxygen, and carbon deposits left. so, in this time the plant matters become coal.

Coal is divided into three main types which are based on the percentage of hydrocarbon, oxygen, and carbon occurs in the coal.

1) Anthracite coal.

2) Bituminous coal.

3) Lignite coal.

5 0
3 years ago
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