Examlex
Which one or more of the following is a vector quantity?
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.
Notochord
A flexible rod-shaped structure that provides support in the embryonic stages of all chordates, including humans.
Tunicates
Marine invertebrates, also known as sea squirts, that are part of the subphylum Tunicata, characterized by a tough outer tunic and filter-feeding mode of nutrition.
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