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What is the habitat and # of living species of:

1.single celled protozoa
2.joint legged arthopods
3.back bone chordates

  • Biology - ,

    3.back bone chordates
    4-6 million species.
    Arthropods can be commonly found in water, salt or fresh, terrestrial and also aerial habitats.

    Search on the internet for the other two.

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