13. Mammal identitycard.
How are mammals
characterized according to
examples of representing
beings, basic morphology,
skin, respiration, circulation,
nitrogen waste, thermal
control and types of
reproduction?

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Examples of representing : dogs,
cats, horses, , elephants, apes,
humans, , whales, dolphins,
opossums, , platypus. Basic
morphology: , diaphragm muscle,
mammary , enucleated red blood
. Skin: impermeable, hairy.
: pulmonary. Circulation:
closed complete, heart with
chambers. Nitrogen waste: .
Thermal control: homeothermic.
of reproduction: sexual,
fecundation, oviparous monotremes
(), marsupials
(metatherians), placental ().