Evolution and diversity of organisms Flashcards
Earth and the other planets of the solar system were formed
4.6 billion years ago.
Life originated on earth
3.5 billion years before
Comes from the fossils of micro-organisms
Fossils of the first photosynthetic organism, today’s cyanobacteria, originated before
2.7 billion years ago
fossils of the first eukaryotic organisms were estimated as from about
1.8 billion years ago
Fossils of the oldest known protists similar to small red algae were dated as
1.2 billion years ago
Many present day animal phyla appeared in which period
Early cambrian period
Several animal groups which include, porifera, sponges, cnidarians (Sea anemones and their relatives) and molluscs appeared in
Late Proterozoic
According to the DNA analysis, sponges evolved
700 million years ago
Ancestors of arthropods, chordates and other animal phyla originated
670 million years ago
Colonization of land by fungi, plants and animals began after about
500 million years ago
With the emergence of large trees, differentiation as
roots, stems and leaves began and diversified since
400 million years ago
first group of animals to colonize land
Arthropods (insects and spiders)
The earliest tetrapods formed about
365 million years ago
evolved from lobed-finned fish
The divergence of human lineage from other primates was initiated
6-7 million years ago
The origin of the human species took place
195,000 years ago
Origin of earth took place in which eon
Hadean eon
Origin of prokaryotes took place in which eon
Archaean eon
Origin of eukaryotes took place in which eon
Proterozoic eon
Diverse algae and soft-bodied invertebrate animals appeared in
Proterozoic eon
What were the dominant animal and plant groups during the paleozoic era
Dominant animal group was amphibians
Dominant plant group was seedless vascular plants
What were the dominant animal and plant groups during the mesozic era
Dominant animal group were reptiles including dinosours
Dominant plant group was gymnosperms
What were the dominant animal and plant groups during the cenozoic era
Dominant animal group was mammals
Dominant plant group was flowering plants
Origin of genus homo took place during
Cenozoic era
Origin of most present-day groups of insects took place during
Paleozoic era