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The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared . The mammals , birds , and flowers so familiar to us are all relatively recent , originating 130 to 200 million years ago . Humans have inhabited this planet for only the last 2.5 million years , and only in the last 200,000 years have humans started looking like we do today . What is biology ? In simple terms , biology is the study of living organisms and their interactions with one another and their environments .
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.