Why was it difficult for early humans to cultivate land prior to the end of the last ice age?

The correct answer to this open question is the following.

It was difficult for early humans to cultivate land before the end of the last ice age because the weather conditions were not favorable for growing crops, the soil of the earth was not ready for agriculture, and the knowledge of early humans about agriculture techniques were minimum. The soil was cold, without the proper nutrients to be cultivated and used to produce crops. That is why early humans were hunter-gatherers that followed herds to hunt them and feed their families. Humans started to learn agriculture techniques during the Neolithic Revolution.

president thomas jefferson hoped that the embargo act of 1807 would the united states by demonstrating to britain and france their dependence on american goods, convincing them to respect american neutrality and stop impressing american seamen. instead, the act had a devastating effect on american trade.

a sample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°c. if the system is at dynamic equilibrium, which of these statements is true?