50. According to Eugene Morton, a scientist, all animal sounds have certain things in common. Animals tend to make low, loud sounds when they are angry and to make high, softer sounds when. they are tearful or friendly. Human beings can, of course, make many more kinds of sounds than most animals, but Morton believes that even human speech has the same features as other animal sounds According to his theory if you say, "I love you. , your voice will be
a naturally high
b, usually very loud
naturally low.
d usually angry. Level three i.