2007-12-16 11:24:47 · 2 answers · asked by abercombie123 1 in Science & Mathematics ➔ Botany
Chlorophytes - ~ 425 MYA to Recent
Bryophytes - ? to Recent
Psilophytes - Late Silurian to Recent
Lycopsids, Sphenopsids, Pteropsids - Devonian (~ 417 MYA) to Recent
Progymnosperms - Devonian to Mississippian (i.e., now extinct)
Gymnosperms - Devonian (?) to Recent
Angiosperms - Lower Cretaceous to Recent
2007-12-17 13:11:45 · answer #1 · answered by mavster 6 · 0⤊ 0⤋
plants were probably not the first life on earth but they came pretty close to the front of the line. One theory is that when cells developed a way to convert sunlight into chemical reactions (photosynthesis), it was the beginning of the habitat that we still enjoy today, an atmosphere with plenty of oxygen and a mechanism for the byproduct of our animal respiration to be recycled back into oxygen. Two things that are very convenient for us animals.
Do some research on this.
2007-12-16 11:49:16 · answer #2 · answered by Gary H 7 · 0⤊ 1⤋