From the fossil record you have two adult primate skulls that have very similar morphological characteristics but one of the skulls is larger and has characteristics that are more pronounced than on the other skull. it is likely that these two skulls represent
a. different species because they are different in size
b. different paleospecies because they are not identical
c. the same paleospecies and are exhibiting sexual dimorphism
d. likely different breeds of dogs because they show extreme variation

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.