Which of these elements is rarely found in organic molecules? hydrogen oxygen barium carbon

Carbon

Explanation: Organic molecules have hydrogen atoms connected to carbon atoms through covalent bonds. The simplest organic molecule, methane. It has three hydrogen atoms connected to one carbon.

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.