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    All the living things that we can see evolved from those that we can’t Every human, bird, tree, and flower can trace its ancestry across a few billion years back to microscopic, single-celled
  • unit 7 test Flashcards - Quizlet
    Study with Quizlet and memorize flashcards containing terms like Lobe-finned fishes were present in the oceans of the world approximately 400 million years ago The first tetrapods (vertebrates that had limbs and could move on land) date to about 365 million years ago One hypothesis states that early tetrapods evolved from lobe-finned fishes Which of the following is the best plan for
  • Biolog Ch 14: Quiz Flashcards | Quizlet
    Study with Quizlet and memorize flashcards containing terms like Three species of tigers have gone extinct due to overharvesting or habitat destruction This is an example of, Based on the cladogram, birds are most closely related to, Birds and mammals are both warm-blooded, and are and more
  • Homo erectus, our ancient ancestor | Natural History Museum
    Fossil evidence for H erectus stretches over more than 1 5 million years, making it by far the longest surviving of all our human relatives Compare this to our own species, Homo sapiens , which has been around for perhaps 400,000 years so far, and we begin to appreciate their ability to survive over a long period marked by many changes to the
  • Plants evolved complexity in two bursts -- with a 250-million . . .
    A Stanford-led study reveals that rather than evolving gradually over hundreds of millions of years, land plants underwent major diversification in two dramatic bursts, 250 million years apart
  • The Biodiversity Crisis | OpenStax Biology 2e - Lumen Learning
    During this period, about 85 percent of marine species (few species lived outside the oceans) became extinct The main hypothesis for its cause is a period of glaciation and then warming The extinction event actually consists of two extinction events separated by about 1 million years





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