Question
Which of these is accurate?
a
Humans are composed primarily of water.
b
Elements making up the human body are mostly potassium and carbon.
c
By volume, humans are 65% oxygen gas.
d
By mass, humans are 2% calcium.
a
Humans are composed primarily of water.
b
Elements making up the human body are mostly potassium and carbon.
c
By volume, humans are 65% oxygen gas.
d
By mass, humans are 2% calcium.
Answers
Answer
why are the others wrong
Answered by
GPT-4o mini
The most accurate statement among the options provided is:
**a**. Humans are composed primarily of water.
Humans are made up of approximately 60% to 70% water by weight. The other statements contain inaccuracies regarding the composition of the human body.
**a**. Humans are composed primarily of water.
Humans are made up of approximately 60% to 70% water by weight. The other statements contain inaccuracies regarding the composition of the human body.
Answered by
GPT-4o mini
Here’s a breakdown of why the other statements are incorrect:
**b. Elements making up the human body are mostly potassium and carbon.**
- While carbon is a major element in the human body (about 18% by mass), potassium is not one of the most abundant elements. The major elements by mass in the human body include oxygen (about 65%), carbon (about 18%), hydrogen (about 10%), nitrogen (about 3%), calcium (about 1.5%), and phosphorus (about 1%), among others. Potassium is important but makes up only about 0.2% of body mass.
**c. By volume, humans are 65% oxygen gas.**
- This statement inaccurately describes the composition of the human body. While oxygen is a major component in terms of mass, it is primarily found in water (H2O) and organic molecules rather than as free oxygen gas (O2). The human body is about 60-70% water, which contains oxygen, but the portion of the body that is purely oxygen gas (O2) is negligible.
**d. By mass, humans are 2% calcium.**
- While calcium is an important mineral for the human body (primarily stored in bones), it constitutes about 1.5% of the body mass, not 2%. Other minerals such as phosphorus are also present, but calcium’s mass percentage is often estimated to be around 1-2%, with most references citing it closer to 1.5%.
In summary, the inaccuracies in these options stem from misstatements about the relative abundances of elements and the forms in which they exist in the human body.
**b. Elements making up the human body are mostly potassium and carbon.**
- While carbon is a major element in the human body (about 18% by mass), potassium is not one of the most abundant elements. The major elements by mass in the human body include oxygen (about 65%), carbon (about 18%), hydrogen (about 10%), nitrogen (about 3%), calcium (about 1.5%), and phosphorus (about 1%), among others. Potassium is important but makes up only about 0.2% of body mass.
**c. By volume, humans are 65% oxygen gas.**
- This statement inaccurately describes the composition of the human body. While oxygen is a major component in terms of mass, it is primarily found in water (H2O) and organic molecules rather than as free oxygen gas (O2). The human body is about 60-70% water, which contains oxygen, but the portion of the body that is purely oxygen gas (O2) is negligible.
**d. By mass, humans are 2% calcium.**
- While calcium is an important mineral for the human body (primarily stored in bones), it constitutes about 1.5% of the body mass, not 2%. Other minerals such as phosphorus are also present, but calcium’s mass percentage is often estimated to be around 1-2%, with most references citing it closer to 1.5%.
In summary, the inaccuracies in these options stem from misstatements about the relative abundances of elements and the forms in which they exist in the human body.
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