Answer:
A. Humans first lived in East Africa.
B. Migration occurred by land and sea
D. Humans crossed a land bridge to North America.
Explanation:
Human migration is defined as the movement of humans from one place to another.
The earliest humans lived in East Africa about 3 million years ago and the earliest humans are known as Homo habilis. Richard Leakey found the first human species in the 1960s at Omo Kibish in south-western Ethiopia.
Migration occurred by land and sea in the earlier time. Humans used land bridges to move from one place to another and whenever sea level goes down they migrate through sea or water sources as well.
During the last ice age, humans crossed a land bridge to North America from Asia about 20,000 years ago. The land bridge is submerged underwater due to rise in sea levels.
Hence, the correct answers are "A, B, and D"
<span><span> Downfall of Mali Empire:</span> </span>Weakened by attacks and internal rewbellion. The Mali lost it's hold on the Gold and Salt trade. The Songhai empire was then able to grow in power and take previously held Mali territories.
The downfall of Songhai Empire: The Moroccan armies invaded Songhai, which led the fall of Songhai empire.
The downfall of Ghana Empire: In the 11th century, when the Almoravids, a militant confederation of Muslims, began to attack the empire and even conquered it for a time. Though their grip on power did not last long, the chaos they brought to the region destabilized trade, hurting the empire's sources of income.
<span>When the government fails to protect the fundamental rights of the people. </span>
A union organizer is a member of the labour movement who "organizes" or unionizes non-union businesses or workplaces.
Organizers are largely responsible for assisting non-union workers in organizing local chapters, usually by helping them through the process.
Thus option C is correct
<h3>What were the tactics employed against labour unions?</h3>
Boycotts, strikes, and sabotage
The strike was the most commonly used tactic by employees. Withholding labour from management would theoretically force the corporation to accept worker terms by causing significant financial losses.
For more information about Union organizer reference link
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