Question

question 23 according to the graphs and what you know about biochemistry, which element makes up a large percentage of the earths crust and is not normally present in organic macromolecules? elements in the human body hydrogen 10% nitrogen 3% calcium 1.5% phosphorus 1% carbon 18% oxygen 65% other 1.5% note: percentages given are by mass. elements in earths crust aluminum 8.1% iron 5.0% calcium 3.6% sodium 2.8% potassium 2.6% magnesium 2.1% other 1.9% silicon 27.7% oxygen 46.6% a nitrogen b oxygen c carbon d silicon

Explanation:

Organic macromolecules (e.g., carbohydrates, proteins) primarily contain C, H, O, N, P, S. Earth's crust major elements: O (46.6%), Si (27.7%), Al (8.1%), etc. O, C are in organic molecules; Si is not normally present.

Answer:

d. Silicon