Within families, organisms are placed into groups called

genus

Explanation:

species that are most similar to each other are put together within a grouping known as a genus.his grouping continues until all organisms are collected together into groups at the highest level.

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .