Approximately how long ago did homo sapen (humans) first  appear on Earth 2,000 years ago 5-7 million years ago 65 million years ago 150,000 - 200,000 years ago    Hominins developed their unique larger brains before acquiring the ability to move on two feet.  True  False   the production of atmospheric oxygen in Earth's environment started with photosynthesis by prokaryotes photosynthesis by multicellular eukaryotes photosynthesis by single celled algae photosynthesis by land plants   Homologous structures among animal provide evidence for evolution in that theses structure are all produced by the same gene different in different animals, but are modifications of the same basic structure similar in function, but of different basic structure all different structures within the same species

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A: We are answering first 3 questions. For rest of questions pls repost.     Oxygen evolution is a…

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Prokaryotic evolution

The term evolution means the gradual change or a transformation from a simple or primitive state to a complex or advanced state. Prokaryotic evolution is a concept that involves the evolution of the form and function of most primitive organisms (prokaryotes) through several stages and changes to form diverse life as a part of organic evolution.