What were the characteristics of life forms that had been fossilised ?
Fossils are formed of hard parts (like bones, teeth, etc.).
Burial should be in a medium where no oxidation of the material can occurs.
Did aquatic life forms get fossilised ? If, yes where do we come across such fossils ?
Cretaceous period of the Mesozoic era is characterised by which of the following?
Seed ferns originated in