15. Proteins are super important because they contain

amino acids

Explanation:

Protein contain amino acids, which play an important role in almost every system in your body.

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.