How did early hunter-gatherers affect the physical environment? They spread seeds when they farmed new areas.
They contributed to a decline in animal populations.
They mined metals to make arrowheads and spearheads.
They used fire to destroy forests across large regions.

answer; i believe the two groups were irish immigrants and chinese immigrants;

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.

while it was true that the cotton gin reduced the labor of removing seeds, it did not reduce the need for slaves to grow and pick the cotton.

explanation:

before eli whitney's invention of the cotton gin, picking and cleaning cotton was a slow, labor-intensive job. workers, usually slaves, had to pick the seeds from the cotton fibers by hand. this invention made it possible to grow large amounts of cotton on big farms and make money.

the answer is b.india