Examlex
Explain the concept of an ecological footprint and identify the source contributing most greatly to humanity's ecological footprint.
Birds
Warm-blooded vertebrates that are characterized by feathers, beaks, and laying hard-shelled eggs, and they have a high metabolic rate and a lightweight skeletal system.
Monotremes
A group of egg-laying mammals that includes the platypus and echidnas.
Marsupials
Mammals that carry and nourish their newborns in an external pouch, including species such as kangaroos, koalas, and opossums.
Placentals
Mammals that nourish their developing fetus via a placenta, an organ that facilitates the exchange of nutrients, gases, and wastes between the mother and fetus.
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