Dolphins (which are mammals) and sharks (which are fish) have stiff dorsal fins projecting from their backs that them maneuver through water. these structures are best described as

How will technology impact medicine in the future?

The phlogiston theory in the 17th century attempted to explain burning. the theory stated that combustable objects contained a material called phlogiston, a substance without mass, color, odor, etc. after objects burned, the objects were dephlogistonated and were then in their true form. the phlogiston theory was accepted until the 18th century, when lavoisier proved that combustion requires a gas that has mass. phlogiston is considered a) to be scientific knowledge b) not to be scientific knowledge c) to be proven by scientific method d) to be accepted in the modern scientific community

Cell specialization occurs by the process ofa. reproductionb. differentiationc. maturationd. growth