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Did organisms that require oxygen exist before photosynthetic organisms?
It would be impossible for oxygen requiring organisms to exist before photosynthetic organisms because there was not oxygen in the atmosphere for these organisms to breathe. Photosynthetic organisms take carbon dioxide and water in and create oxygen as waste. Before these photosynthetic organisms existed there was not enough or any oxygen in the atmosphere for organisms requiring oxygen to survive.
Sexual reproduction evolved before the evolution of?
Sexual reproduction evolved before the evolution of multicellularity. Organisms were able to reproduce sexually as single-celled organisms before multicellular life forms emerged.
What was the evolution before vertebrates?
The same as it was when and after vertebrates. Evolution is the change in allele frequency over time in a population of organisms. Change over time. Happens and happened in single celled organisms and invertebrates long before there were vertebrates.
What must photosynthetic bacteria provide before any eukaryotes could evovlve?
Oxygen. Photosynthetic bacteria were essential in producing oxygen through photosynthesis, which created an oxygen-rich atmosphere. This new oxygenated environment allowed for the evolution of aerobic metabolism in eukaryotes.
How did the evolution of photosynthetic prokaryotes affect the level of oxygen in the atmosphere?
Photosynthesizing prokaryotes affected the ancient atmosphere by adding oxygen. In ancient times the oxygen level was .42%, compared to the 21% oxygen level now. Photosynthesizing prokaryotes have made the world livable today.
What does embryology tell you about evolution?
Ontogeny recapitulates phylogeny, or the development of the individual summarizes the evolution of the species. For example, human embryos go through a stage in which they develop gills as did their aquatic forerunners.
What is effect of plate movement on the evolution and diversity of animal and plant species?
Plate movements has lead to dispersion of different organisms over time. Animal and Plant species of different types have been transported and displaced to new environments resulting to introduction of species that did not exist in an area before to become an inhabitant of such place.
What was the earth's atmosphere before like photosynthesis?
Before photosynthesis, the Earth's atmosphere was primarily composed of carbon dioxide and nitrogen, with very little oxygen. The emergence of photosynthetic organisms led to an increase in atmospheric oxygen levels over time.
What must photosynthetic bacteria provide before eukaryote could evolve?
Oxygen Production.
Who evolves before grimer in Pokemon?
Grimer does not have a pre-evolution. The Pokemon before Grimer in the PokeDex is Dewgong, evolution of Seel.
What is the order of evolution from the simplest to most complex?
The earliest cells came before the most complex organisms existing today. :]
In what form did DNA exist before the evolution of cellular organisms?
amino acids formed from chemicals. DNA is a molecule, and it is a molecule containing other smaller molecules. DNA ->Nucleotides -> Amino Acids -> Chemicals.
