in response to a steak dinner, certain secretions are needed to aid digestion. what cells in the pancreas would provide these secretions?

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.

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

the must be sensory neurons.  

hope its .

that scientist would be robert hooke

that is true   : ) hope this you