Examlex
What is the name for the element with six protons in the nucleus?
Placental Mammals
Mammals that nourish their unborn offspring through a placenta, allowing for longer gestational periods and more developed young at birth.
Monotremes
Egg-laying mammals, such as the platypus and echidna, characterized by their unique reproductive system.
Marsupials
Mammals that carry and nurture their young in a pouch.
Jawless Fishes
A group of fish characterized by their lack of a true jaw, examples include lampreys and hagfishes.
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