Classifying things by observation can best be done using a

classification system

Explanation:

All the living things are different, but if you want to classify them, you need to have some characteristics in common, for example, if they have shell or skin, if they reproduce sexual o by asexual means. If they are plants, the shape of the leaves is a criteria, also if they have flowers or not, etc.

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.

b is the best answer for this question.