Question
Some placental animals provide nutrients to their embryos from an attached membranous yolk-containing sac. They are called:a. oviparous animals.b. ovoviviparous animals.c. metatherians.d. eutherians.e. mammals.
Step 1
From the explanation, we know that these are mammals. The yolk sac provides nutrition and gas exchange between the mother and developing embryo before the placenta is formed. This is a characteristic of mammals. Show more…
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Some placental animals provide nutrients to their embryos from an attached membranous yolk-containing sac. They are called: a. oviparous animals. b. ovoviviparous animals. c. metatherians. d. eutherians. e. hermaphrodites.
Organisms that lay eggs are said to be a. oviparous. b. ovoviparous. c. viviparous. d. placental. e. none of the above.
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