Generally, any "thing" has many different qualities. If it shares roughly half these qualities with another "thing" they could be said to be very different and yet similar. <span>In the case of cells, plant cells and animal cells both have a nucleus, protoplasm, vacuoles. Plant cells have cell walls and a more rigid structure</span>
The photoreceptors would be your eyes, chemoreceptors skin, olfactory for nose and mechanoreceptors for obviously tongue hope this helps.
D It all depends on dna, who, how, were, etc. Heredity