Question

relative composition of living v. nonliving matter (bar graph with organisms and earths crust for elements h, c, o, n, ca and mg, na and k, p, si, others)
options:

• oxygen and sodium
• hydrogen, carbon, oxygen
• nitrogen and calcium
• carbon, sodium, potassium

Explanation:

To solve this, we analyze the bar graph for "Organisms" (living matter). The bars for H (hydrogen), C (carbon), and O (oxygen) are among the tallest for organisms, indicating high relative abundance. Other options: oxygen and sodium (sodium's bar for organisms is short), nitrogen and calcium (both have short bars for organisms), carbon, sodium, potassium (sodium and potassium have short bars for organisms) don't match.

Answer:

B. hydrogen, carbon, oxygen (assuming the second option is labeled B; if options are A - D with the second being B, then the answer is B. hydrogen, carbon, oxygen)