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Chapter 47: Problem 6

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.

Short Answer

Expert verified
The correct answer is d. eutherians

Step by step solution

01

Understanding the Terminology

In order to answer this question, it's crucial to know what each term means. Oviparous animals are those that lay eggs, with little or no other embryonic development within the mother. Ovoviviparous animals are species in which embryos develop inside eggs that are retained within the mother's body until they are ready to hatch. Metatherians are a subgroup of mammals that includes marsupials. Eutherians, also known as placental mammals, comprise the largest group of mammals and are distinguished by their mode of reproduction in which the fertilized egg implants into the uterus of the female. Lastly, mammals are a group of animals that have mammary glands which in females produce milk for feeding their young.
02

Discarding Incorrect Choices

Looking at each of the options, we can discard some options right away. Option a, oviparous animals, is incorrect because these animals lay eggs, and their young do not receive nutrients via a yolk sac attached to the mother. This also applies to option b, ovoviviparous animals, the embryos develop inside the eggs not from an attached sac. Option c, metatherians, are generally marsupials, and while they do give birth to live young, it's not via a yolk-containing sac. So this choice is not correct either. Option e, mammals, is too broad. While the organism in question is likely a mammal, not all mammals provide nutrients to embryos through a yolk-containing sac. So this choice is also incorrect.
03

Identifying the Correct Choice

After eliminating the options that don't fit the description, we're left with option d, eutherians. Indeed, in eutherian or placental mammals, the embryo develops inside the uterus of the mother, attached to a membranous yolk-containing sac or placenta. This organ serves as a conduit for nutrients from the mother to the embryo. This indeed fits with the description given in the question. Therefore, the correct answer is eutherians.

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