Question

2,500,000 bce 2,000,000 bce 1,500,000 bce 1,000,000 bce 500,000 bce 1 ce
2.58 million bce – the last ice age begins
500,000 bce – humans learn to control fire
14,000 bce – the last ice age concludes
11,000 bce – humans domesticate dogs
9000 bce – extinction of large animals in north america
7000 bce – humans domesticate corn
present day
a. the use of domesticated dogs helped humans hunt large north american animals to extinction.
b. during the last ice age, it was always far too cold for humans to learn to control fire.
c. large north american animals went extinct because humans began domesticating the corn they ate.
d. humans developed control over fire to help keep their domesticated animals warm during the winter

Explanation:

• Option A: The timeline shows humans domesticated dogs (11,000 BCE) before the extinction of large North American animals (9000 BCE), so this causal link is plausible.
• Option B: Humans learned to control fire (500,000 BCE) during the last ice age (which began 2.58 million BCE and ended 14,000 BCE), so this is false.
• Option C: The extinction of large North American animals (9000 BCE) happened before corn domestication (7000 BCE), so this causal link is impossible.
• Option D: Fire control (500,000 BCE) was achieved long before animal domestication (11,000 BCE), so this is false.

Answer:

A. The use of domesticated dogs helped humans hunt large North American animals to extinction.