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Furkat [3]
3 years ago
6

You have been dispatched to a residence where a woman lacerated her arm after falling while holding a drinking glass. She inform

s you that when she was first cut, blood spurted from the wound, and then within a second or two, it subsided to a mere trickle. She asks why this would happen. Which one of the following is the correct response?
A) "Blood has the ability to clot within a second or two of injury."
B) "Blood vessels tend to constrict quickly once they are injured."
C) "Red blood cells will quickly repair the injury to the blood vessel."
D) "The skin around the injured blood vessels quickly swells and stops bleeding."
Biology
1 answer:
miss Akunina [59]3 years ago
5 0

Answer:

The answer is B.

Explanation:

According to the details given in the example, because she cut a blood vessel, the blood vessel, using the muscles along the walls of the vessel, constricted as quickly as possible once it was cut to be able to stop the bleeding. So the answer is option B.

I hope this answer helps.

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Answer:

subtitution mutation

Explanation:

The T in the middle is subtituted with C.

Hope it helps.

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3 years ago
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Newsweek in 1989 reported that 60% of young children have blood lead levels that could impair their neurological development. As
Kamila [148]

Answer:

The answer is 83.38%.

Explanation:

The probability of young children having blood levels that impair their neurological development is given as 60% in the question. To find the probability of at least 5 children out of 10 in a sample having said blood levels, we need to use the binomial probability.

n represents the total number of children in the sample so n = 10 and p is the probability of the children having blood levels causing the problem which is 60% so p = 0.6.

We want the probability of it being observed for 5 or more children and that is P(x\geq 5). If we subtract the P( x\leq 4) from 1, which is the probability of not observing the condition in 5 or more children, we will have the P(x\geq 5).

1 - P(x\leq 4) = 1 - pbinom(4, 10, 0.6) which are the probability range in the function, the sample size and the probability of observing the condition respectively.

The result is 1 - 0.1662 = 0.8338 which means that the probability that is asked is 83.38%.

I hope this answer helps.  

8 0
3 years ago
A student wants to perform an experiment to test the effect of different colored lights on the growth of basil plants. She sets
Elena-2011 [213]

Answer:

light is the independent variable, height of the plant is the dependent variable. Dependent is the effect that based on the independent.

Explanation:

lets break it down. 1) you want to know the effect of something you apply from one thing to another. Let say, if you grow your plants under the sunlight, the plants grow taller. In this case, the sunshine is the independent variable whereas the height of the plant/how tall it can grow is the dependent variable. 2)NOW, before i give the answer. The design of the question is not good for high school students. i think your teacher thinks "light" is the independent variable. 3)However, the question contains confounding variables in it because different lights might produce different effects to the height of the plants. If you want to test if plants are exposed to light grows taller than plants do not expose to light, then you should have all the lights are the same. 4) So, all the plants should be exposed to one certain light to avoid confounding. Confounding means that either red light and sunlight are both produce the same effect whereas the other colors do not help the plants to grow taller. 5)Your teacher should test one light at a time. So, if he is testing with all different colors of light, then light is the independent variable, and height of the plant is the dependent variable.

4 0
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