Nerve pathway from finger to brain

Receptors, spinal cord, nerves, thalamus, sensory cortex

Explanation:

When you touch an object the Touch receptors receive the stimulation. The impulse from this travels to the Spinal Cord through the sensory nerves. Those nerves come into contact with others, sending it to the thalamus and sensory cortex.

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.