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This is kind of a guess, but I would say photosynthesis since some of the first organisms on earth were bacteria that did photosynthesis.
Pre-Cambrian.
Animal cells are Eukaryota, so they are not the first examples of cells. Archaebacteria, though they are possibly more closely related to eukaryote than bacteria are, do possess more of the hypothesis ancient methods of energy production (like thermoautotrophism and chemotherapeutic) which were prevalent before photosynthesis and aerobic respiration. Mitochondria are related to bacteria (specifically purple photosynthetic bacteria), and they perform aerobic respiration. Aerobic respiration cannot have been the original method for deriving energy, as it required oxygen - which was not abundant in the atmosphere until photosynthesis evolved. Chloroplasts are also related to bacteria (cyanobacteria) and they perform photosynthesis. It is currently believed that photosynthesis was not one of the original methods for deriving energy. So my answer would be archaebacteria.
No, they were not Toxic was actually poinsonous to the Anaerobic photoautotrophs. However cyanobacteria (a.k.a pondscum) is believed to be the first bacteria to give off oxygen as a by-product of photosynthetic processes.
photosynthesis occurs in the green parts of a plant which contain the pigment chlorophyll
no
This is kind of a guess, but I would say photosynthesis since some of the first organisms on earth were bacteria that did photosynthesis.
Pre-Cambrian.
Impossible to say. However, photosynthetic bacteria were around long before plants.
Oxygen evolved for first time. Many compounds were oxidised
Probably a form of bacteria. They evolved into multicellular organisms. Some evolved into plants because they could do photosynthesis
Animal cells are Eukaryota, so they are not the first examples of cells. Archaebacteria, though they are possibly more closely related to eukaryote than bacteria are, do possess more of the hypothesis ancient methods of energy production (like thermoautotrophism and chemotherapeutic) which were prevalent before photosynthesis and aerobic respiration. Mitochondria are related to bacteria (specifically purple photosynthetic bacteria), and they perform aerobic respiration. Aerobic respiration cannot have been the original method for deriving energy, as it required oxygen - which was not abundant in the atmosphere until photosynthesis evolved. Chloroplasts are also related to bacteria (cyanobacteria) and they perform photosynthesis. It is currently believed that photosynthesis was not one of the original methods for deriving energy. So my answer would be archaebacteria.
Cyanobacteria or blue-algae are microbes that produce oxygen through the process of photosynthesis. Some scientists believe that these bacteria were the first to produce oxygen on Earth.
It is the first step. First step of the photosynthesis.
No, they were not Toxic was actually poinsonous to the Anaerobic photoautotrophs. However cyanobacteria (a.k.a pondscum) is believed to be the first bacteria to give off oxygen as a by-product of photosynthetic processes.
photosynthesis obviously der brains!
photosynthesis occurs in the green parts of a plant which contain the pigment chlorophyll