They each play a vital role in the world we know.
Answer:
Object A but not object B
The answer is yes
The Arrector Pili, a small bundle of muscle fibers, which is attached to the follicle at the base of every hair. This muscle group is connected to the autonomic nervous system and contracts to raise the hair in response to stimuli.
"Inorganic material" is that matter which helps plant to complete the cycle and it's provided by decomposers 'cause they break down dead matters into it.
Hope this helps!