Scientist have discovered many fossils of dinosaurs. However, they have not discovered any dinosaur's fossils in rock layers that are younger than
65 million years old. What conclusion can be drawn from this evidence?

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Explanation:

Discover what scientists can learn by studying fossils and how these fossils ... A fossil is any evidence of prehistoric life (plant or animal) that is at least 10,000 years old. The most common fossils are bones and teeth, but fossils of footprints and ... Over millions of years, water in the nearby rocks surrounds these hard parts

not sure if this is what you'r looking for nnew= nold

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.