Americans decided to slaughter thousands of bison because... А
the Plains Indians used the buffalo in battle.
B
Americans could not develop houses in the Midwest until they were
killed.
American advancement to the west could not continue if they were
threatened by wild buffalo.
the U. S. government knew that many of the Plains Indians depended
on the buffalo for survival.

D

Explanation:

the U.S. government knew that many of the Plains Indians depended

on the buffalo for survival

the answer is D

major league baseball

explanation:

jack roosevelt robinson broke the color barrier in major league baseball.as he was the first african american to play in the major leagues, jackie robinson became the target of racial abuse. jackie robinson is referring to the historic event, harlem riot.

answer: b (host)

viruses use the cells of living organisms to reproduce. the cell which is used by virus is called as "host cell". it is a living cell in which virus multiplies, example bacteria, plant or an animal cell.

in this, the virus is a parasite, which uses host cell for its benefit (reproduction) by using the cell machinary of host cell.