i believe the answer is d. hope it helps
The answer is in your heart and soul
They must find food
they must find shelter
I don't know if this will help but I did a little research and found this-
"A fundamental understanding of the different components of soil organic matter is required to best use it to improve farming systems. Total organic carbon forms are derived from the decomposition of plants and animals. They are capable of decay or are the product of decay..."
They are all formed from data, predictions and observations.
