Will develop pharyngeal arches. will develop a postanal tail in the embryonic stage.

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The answer is

1. Barb fish

2. Newts

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The answer to the question: ___ will develop pharyngeal arches. ___ will develop a postnatal tail in the embryonic stage, would be, as follows:

1. Barb fish. During embryonic development of vertebrates, the precursors for such development are known as pharyngeal arches. In the case of fish, these pharyngeal arches are better known as branchial arches, or gill arches and from here the embryonic fish will develop. The one option then to fill in this blank is Barb Fish.

2. Newts: Belonging to the salamander family, this little animal, during the embryonic stage will be able to develop a tail, which will later become a part of the adult newt, or salamander. Newts are amazing because they go through a process known as metamorphoses and it literally means that they change from being a taleless being, to growing a postanal tail.