Fossils are found in: (A) sedimentary rock
(B) sedimentary and igneous rock
(C) metamorphic rock
(D) sedimentary and metamorphic rock

Pluto was once classified as a planet. however, scientists no longer classify pluto as a planet. which is a likely reason for this change? the original hypothesis about pluto was supported. no observations of pluto were made in the past. several planets in outer space were found to be similar to pluto. there were significant changes in scientific knowledge about planets.