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4 years ago

How is it possible that only 92 elements are found in the natural world but there are millions of different types of molecules?

1 answer:

7 0

You are confusing elements - atoms - and molecules. There are indeed 92 natural elements, H to U. Each element appears as individual atoms, such as hydrogen atoms, carbon atoms, etc. These individual atoms can and do bond with each other to make molecules, such as methane CH4, water H2O, etc. I hope you are not confused anymore.

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21. Describe the three steps by which a population<br> of insects becomes resistant to a pesticide.

Tresset [83]

Answer:

1. Survivors of the pesticide have a gene that protects them from it.

2. Then the survivors pass on the gene to their offspring,

3. Each time the pesticide is sprayed, the insects have a greater chance of survival.

6 0

3 years ago

Which statements describe dichotomous keys? Check all that apply.

miskamm [114]

Answer:

1,3,4

A dichotomous key uses questions or statements to help identify organisms, it also uses characteristics in it's questions ( that may be yes-no) and statements to help separate organisms from one another.

Hope this helped and plz mark as brainliest!

Explanation:

7 0

4 years ago

Which sentence best describes the process of convection?

Mazyrski [523]

When cool air sinks it forces warm air to rise is a example of convection.

4 0

3 years ago

Two or more atoms can combine to form a molecule. True or false?

Anarel [89]

Answer:

True

Explanation:

5 0

3 years ago

Read 2 more answers

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