Oil (fossil fuels)
Coal (smog, soot, acid rain, etc.)
Answer:
I would first put jaws at number one because most of the other options are for mammals while some marine life has jaws too.
<span>Dr. Jack Horner's discovery shower that dinosaurs and the very first birds lived at the same time. He noticed similarities in their features and habitat. This supported his hypothesis and later proved that birds evolved form dinosaurs.</span>