I believe it is 4)Shearing teeth (Carnassial teeth)
Amniotic egg are for reptiles
Fur are for marsupials, and dogs
Retractable claws are are cats
Shearing teeth are for carnivores
Physical is something you can have/ hold and mental is something in ur head that you can't see or hold.
The pollutants in 1970 were the highest since recorded history and are declining steadily.