41 Comments

  1. Kyra Baker says:

    All mammals have hair, mammary glands, and a four chambered heart.

  2. Jacob Evans says:

    There are 3 types of mammals

  3. Maddi Jussel says:

    Mammals appeared 220 million years ago.

  4. Hannah Eberl says:

    There are 3 types of mammals; marsupials, placentals, and monotremes

  5. Nicole Phinney says:

    Monotremes are different because they lay eggs and have a cloaca.

  6. Hayley Ehlers says:

    The limbs, fingers, and toes of many mammals are adapted to their particular way of life

  7. All mammals have two notable features which are their hair and mammary glands.

  8. Isaiah Daws says:

    Mammals appeared 220 million years ago and there are 3 types of mammals, marsupials, placentals, and monotremes

  9. Riley Glause says:

    Mammals first appeared during the Triassic period, around 220 million years ago.

  10. Megan Heineman says:

    All mammals have two notable features; hair and mammary glands

  11. Jon R. says:

    the first mammal appeared 220 million years ago.

  12. Heather Pohlmeier says:

    Mammals are divided into three groups

  13. Devin Tatro says:

    Mammals made their first appearance on earth around 220 million years ago

  14. Darian Candle says:

    Mammals appeared around 220 million years ago (during the Triassic period)

  15. Shelby M. says:

    Mammals have evolved from smaller, nocturnal animals, some traits are fur and mammary glands.

  16. Salina says:

    Mammals first appeared around about 220 million years ago

  17. Stetson Guyette says:

    3 types of mammals – marsupials, placentals, and monotremes

  18. Sarah Ruzicka says:

    Mammals appeared around 220 million years ago

  19. Bailey Parr says:

    All mammals have two big things: hair and mammary glands.

  20. Brandon Gannon says:

    There are three types of mammals: monotremes, marsupials, and placentals.

  21. Raigan says:

    The two main groups of primates are prosimians and arthropoids

  22. Beatriz Rodriguez says:

    The frist true mammals appeared during the late triassic period, about 220 million years ago.

    1. Kyra Baker says:

      *first

  23. Alexis Pedersen says:

    Mammals first appeared around 220 million years ago

  24. Taylor Wieland says:

    The first mammals appeared around 220 million years ago

  25. Abby Dvorak says:

    Two*

  26. Abby Dvorak says:

    The toe main groups of primates are prosimians and anthropoids

  27. Tyler Steinacher says:

    The first mammal that appeared was 220 million years ago.

  28. Ryleigh Brandt says:

    the first mammals appeared 220 million years ago, and they had hair, mammary glands, and milk for their young

  29. Alli Mehring says:

    220 millions years ago, the first mammal appeared with hair, mammary glands, and larger brains.

  30. Austin Fransisco says:

    220 million years ago during the Triassic period the first mammals appeared.

  31. Isabel Contreras says:

    Mammals make milk to nourish their young and they also have large brains.

  32. Lauren Rookstool says:

    There’re three groups of mammals

  33. Taylor Kool says:

    All mammals have hair and mammary glands. And in females the mammary glands have milk that they use to nourish their young.

  34. Maddie Schultz says:

    Mammals first appeared around 220 million years ago during the Triassic period

  35. Mikayla H. says:

    All mammals and have milk so they can nourish their young

  36. Kayla Bachle says:

    Mammals have very evolved and large brains.

  37. Jordyn Retzlaff says:

    220 million years ago, during the Triassic Period, the first mammals appeared.

  38. Sarah Rathman says:

    In the Triassic Period, which is 220 million years ago, the first mammals appeared.

  39. Wyatt says:

    The first mammals appeared around 220 million years ago during the Triassic Period.

  40. Sarah Hoban says:

    All mammals have hair, mammary glands, and have milk to nourish their young.

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