Choose all the answers that apply. which of the following are chemical changes? rusting souring melting boiling freezing

Rusting and souring involve chemical changes.  They're the only ones on the list where new substances are created if you wait long enough.

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.