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aev [14]
3 years ago
12

Which of the following are signs that a boy is going through puberty? A. growth of facial hair and longer finger nails B. voice

gets deeper and growth of facial hair C. voice gets deeper and hair color changes D. shoulders broaden and skin darkens
Biology
2 answers:
Sholpan [36]3 years ago
6 0

Answer: B. voice gets deeper and growth of facial hair

Puberty can be defined as physiological, morphological and anatomical changes that occur in a human body. It is a stage of growth which forms transition between childhood and adulthood. It starts in the age of 8- 12 years. It is caused by the release of the androgen, and testosterone hormones which brings changes. The changes like deepening of voice and growth of the facial hair are the examples of signs that develop in boys during puberty.

Savatey [412]3 years ago
3 0
 B.voice gets deeper and growth of facial hair
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A sound wave with a frequency of 300 hertz is traveling through a medium at a speed of 320 meters/seconds. What is it’s waveleng
dalvyx [7]

1. The wavelength is the ratio of the wave's speed to its frequency in hertz or 1/s. This is shown below,
                           λ = s / f = (320 m/s)  / (300 1/s) = 1.07 m
The wavelength is approximately 1.07 m.

2. The frequency is the ratio between speed and the wavelength,
                        f = (330 m/s) / 0.45 m = 733.33 hertz

Read more on Brainly.com - brainly.com/question/1553993#readmore
5 0
3 years ago
Which of the following do all vertebrates have in common? More than one answer is possible.A. mammary glandsB. craniumC. vertebr
Maksim231197 [3]

Answer:

The correct answer is vertebral column and cranium

Explanation:

Vertebrates are the animals that are characterized by having backbone or vertebral column and apart from the vertebral column they also have a bony skull. Skull and vertebral column protect the brain and spinal cord in vertebrates.  

Vertebrata is a subphylum under phylum Chordata and clade Craniata so vertebrates have both cranium and vertebral column. In vertebrates, notochord is present in the embryonic stage and is replaced  by vertebral column in adults.

Animals that comes under the Vertebrata are fishes, mammals, reptiles, amphibians, and birds. So the correct answer is B and C.

7 0
3 years ago
Pseudomonas A. are resistant to many disinfectants and antimicrobials.B. are mostly harmless except for the opportunistic P. aer
OLga [1]

Answer:

The best answer is option E.

Explanation:

Pseudomonas are gram-negative bacteria which is present almost everywhere air, soil, water and even indoors. These gammaproteobacteria are also present in some of the healthy people.

Pseudomonas is resistance to many antimicrobials and disinfectants. These bacteria are generally harmless but some opportunistic species like P. aeruginosa are infectious.

Thus, the correct answer is option E.

6 0
3 years ago
How does a catalyst influence a chemical reaction?
tamaranim1 [39]

Answer:

decreases amount of energy necessary for reaction to proceed

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The human digestive system is a group of organs that break down food, absorb blank
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Absorb Energy

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3 years ago
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