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During the early stages of embryo development, dolphins have gill pouches. What does this mean?
a.Dolphins evolved from fish.
b.Fish evolved from dolphins.
c.Dolphin embryos go through a fish phase during development.
d.Dolphins and fish share a distant, common ancestor.

Answer :

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I think the correct answer among the choices presented above is option C. Dolphins having gill pouches would mean that dolphin embryos go through a fish phase during development. Dolphins are closely related so dolphins should go through a fish phase.

Answer:

During the early stages of embryo development, dolphins have gill pouches. What does this mean?

A. Dolphins evolved from fish

B. Fish evolved from dolphins

C. Dolphin embryos go through a fish phase during development

D. Dolphins and fish share a distant, common ancestor

The correct answer after graded in ody-ssey-ware in particular was D. Dolphins and fish share a distant, common ancestor.

Explanation:

Most likely because it is a better version of A.  Dolphins and humans are members of the vertebrate class Mammalia.  The unit prior to this question stated that Comparitive Embryology tells us organisms that are more closely related have more similar embryo development.  

The unit prior Evidence of Evolution stated that the two separate evolved species of shark and dolphin share a common ancestor thus have Homologous structures AND analogous structures as a result of convergent evolution within the water environment. Humans have homologous but not analogous structures with dolphins and sharks.

Fish=  

Kingdom: Animalia

Clade: Olfactores

Phylum: Chordata

Subphylum: Vertebrata

Humans & Dolphins also in mammal category thus more closely related.

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