Which of these is an organism?
herd of sheep
wolf
drop of water
heart

singular it is a wolf plural it is herd of sheep

but both are correct

wolf

Explanation:

An organism is an individual animal, plant, or single-celled life form.

The herd of sheep is more than one so that's cancelled out.  A drop of water is not a plant, animal, or alive so that's cancelled out.   A heart can beat but it's the human's body as a whole that lives and runs so that's canceled out.  Leaving the only option 'wolf' to fit the criteria of being an organism.

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osteogenesis imperfecta (oi) refers to a congenital ailment of bones. in the condition, the bones become brittle or fragile. this ailment is a general result of the defect or mutations in the genes (colia1 or colia2). this mutation results in imperfect collagen formation either in quantity or quality wise.  

there are eight kinds of oi defects, and each kind varies with certain distinctions in symptoms. the usual symptoms include frequent bone fractures, loss of hearing in infants, protruding eyes, discoloration of the white in the eyes, respiratory issues, loosening of the joints, short stature, and other symptoms.