monotremes, marsupials, and etherians Flashcards
(7 cards)
1
Q
what organisms are in the class monotremes?
A
platypus, echidna
2
Q
how do monotremes reproduce?
A
oviparous, lay egg, produce milk but lack nipples
3
Q
what organisms are marsupials?
A
kangaroos, wombats, opossums, koalas
3
Q
how does gestation work in marsupials?
A
young crawl into pouch from vagina and attach to nipple where they finish developing
4
Q
what is the main characteristic of marsupials?
A
presence of a pouch
5
Q
what are etherians known as?
A
placental mammals, vivparous
6
Q
how does exchange b/w maternal and fetal circulatory systems occur?
A
diffusion across the placenta
