Answer:
To state the objects’ identities
Sentences in the Passive Voice =>> Title of Text
1 They are called ores =>> Rocks
2 These crystals are called gems =>> Rocks
3 Male chickens are called cockerels, =>> Chickens
4 Female chickens are called hens =>> Chickens
5 Female cattle are called cows and the males are called bulls. =>> Cows and Bulls
6 Female cattle that are reared for their milk are called dairy cows. =>> Cows and Bulls