That is presumably why the theory considered only agricultural labor to be valuable.

This theory considers that reading is an unnatural act carried out for a very brief period in human evolutionary history.

Other theories consider that the island is named because it was a trading center in the ivory trade.

Interesting theories, I will consider them in future use.

Most recent theories consider that this process is carried out entirely by and inside the brain.

Rather, this theory considers perturbations to a presumed oriented sample.

The second theory considers the origin to be in water, from marine reptiles.

Traditional agricultural economic theory considered small farms inefficient, a stance that began to be challenged in the 1950s.

Some theories consider sleep to be an important factor in establishing well-organized long-term memories.

Another theory considers that either the boy or his sister or both are dead.