Which percussion instruments were added to the modern orchestra to make unique and interesting sounds -timpani, horns, and bells -typewriters, sirens, and hammers -contrabassoon, piccolo, and triangle

answer; timpani,horns and bells;

for those of you who searched "which list includes four types of animal-like protists? " and keep getting these results, the answer is c: flagellates, sarcodines, ciliates, parasites