Which of the following is true?
1. ear drum contains receptors for hearing
2. cochlea changes shapes to help you focus
3. retina changes light rays into neural impulses
4. lens stimulates the neurons in your olfactory epithelium
5. odor molecules location where sound waves strike

1. ear drum contains receptors for hearing.

Explanation:

Ear drum is an important part of human ear. Its function is to change the sound waves into vibration form and send these vibrations to the inner ear through middle ear i. e. cochlea which is responsible for the hearing and recognizing different sound. Cochlea is a main organ of ear for hearing sounds. If cochlea is damaged, sound can't be hear.

answer///multiple alleles;

the correct answer is 2 and 4