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Kobotan [32]
3 years ago
15

About 20-25% of the 92 natural elements are known to be essential to life. which four of these elements make up approximately 96

% of living matter?
a.carbon, sodium, hydrogen, nitrogen
b.carbon, oxygen, phosphorus, hydrogen
c.oxygen, hydrogen, calcium, nitrogen
d.carbon, hydrogen, nitrogen, oxygen
e.carbon, oxygen, nitrogen, calcium
Chemistry
1 answer:
Gnom [1K]3 years ago
5 0
E. Carbon, Oxygen, Nitrogen, & Calcium.
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3 years ago
Below are the steps of the engineering process (not necessarily in order): 1) Know the background 2) Do the work 3) Make a plan
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Answer:

4 - 1 - 3 - 2 - 6 - 5

Explanation:

During an engineering process, first, we need to identify the problem, or the need because the process only will occur because of some need. Then, it's necessary to know as much as possible about the problem and the things that already exist or already were tested to solve it. Knowing the background will make the work easy.

After that, it's necessary to plan the things we'll do, knowing the costs, the time needed for activities, how many people will be necessary for each step, etc. It's really important to make a plan. Then, do the work, following the plan. Thus, the process must be tested. During the test of the results, some problems must be found, so it's time to evaluate and redesign the process, to solve these problems found.

3 0
3 years ago
Which of the following is an
eimsori [14]

Answer:

2 and 4

Explanation:

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For 2, the oxygen is simply heating up and expanding which pops the balloon. 4 is just a phase change of water vapor to liquid water.

5 0
3 years ago
HELP 10pts!
masha68 [24]

IM IN THAT CLASS TOO

Im abt to do it and ill send u all the answers when im

done, add me on sxxap or instaxxxgram so i can send it to u

my userneamen both: Bellaberrygood

5 0
2 years ago
How many sublevels inn the second energy level?
GREYUIT [131]

There are two subshells that are s and p, which are present in the second energy level.

The energy level can be defined as the fixed distances from the nucleus of an atom where electrons may be found. Each energy level is divided into some Subshells. These subshells are known as s-subshell, p-subshell, d-subshell, and f-subshell. This subshell contains some orbitals, these orbitals are the place where there is the maximum probability of getting the electrons. In one orbital, a maximum of two electrons can be present.

Hence, there are two subshells in the second energy level.

Learn more about subshells here:

brainly.com/question/26438203

#SPJ10

4 0
1 year ago
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