Which group of people was most directly affected by the Twenty-Sixth
Amendment?

People 18 year or older. ( Mainly 18, 19, and 20 year olds were affected because previously you could only vote if you were 21 years or older, so the 26th amendment changed that).

Explanation:

Amendment Twenty-sixth to the Constitution of the United States is very significant in the history of constitutional amendments of the United States. This Constitutional Amendment lowered the minimum voting age. Following this amendment, the voting age of American citizens was reduced to 18 from 21. Moreover, this Amendment prevents the federal and the state government from employing age as a reason for rejecting the right to vote to any of the U.S. citizens who is at least 18 years of age.

d. she conquered the black sea coast and parts of poland.

c.) biotic: snails; abiotic: temperature climate