I think most of it is just cultural conditioning, we play major key songs when we're happy and minor key songs when we're sad (though this is changing in modern music). Another part of it could be that minor chords have their midtones clash a bit more with there tonic notes than major chords, it sounds slightly "wrong" to our ears and takes away from the happy effect.
Answer: Animals
Explanation:
Common motifs found in cave paintings are mostly of animals. The paintings of those at Lascaux and Altamira have a distinct feature of different types animal drawings of which some are horses, bulls, deer, cattle.
The paintings look more like they have been sculpted because the actual layout of the rock in the cave was used.
