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Q: During the early stages of embryo development, dolphins have gill pouches. What does this mean? Dolphins evolved from fish. Fish evolved from dolphins. Dolphin embryos go through a fish phase
during development. Dolphins and fish share a distant, common ancestor.
A: It means dolphins probably have an ancestor that had gills, but then evolved into a land animal. The fact that dolphins do not have gills is also good evidence that they evolved from a land animal. [ It also means that an ancestral character that was lost in evolution usually cannot re-evolve, even though there is a need for it. Animals and plants do not simply evolve traits that they need to
survive. Some species simply had the good luck to possess traits that by chance allow them to adapt better to a new environment. In fact, many species became extinct because they simply did not have the good luck to have the traits that they desperately needed to survive. Evolution, therefore, does not, as some people may insist, inevitably lead to better, more complex or more intelligent organisms. There is no such thing as an evolutionary trend, even with the benefit of hindsight. ]
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Original conversation
User: During the early stages of embryo development, dolphins have gill pouches. What does this mean? Dolphins evolved from fish. Fish evolved from dolphins. Dolphin embryos go through a fish phase during development. Dolphins and fish share a distant, common ancestor.

Weegy: It means dolphins probably have an ancestor that had gills, but then evolved into a land animal. The fact that dolphins do not have gills is also good evidence that they evolved from a land animal. [ It also means that an ancestral character that was lost in evolution usually cannot re-evolve, even though there is a need for it. Animals and plants do not simply evolve traits that they need to survive. Some species simply had the good luck to possess traits that by chance allow them to adapt better to a new environment. In fact, many species became extinct because they simply did not have the good luck to have the traits that they desperately needed to survive. Evolution, therefore, does not, as some people may insist, inevitably lead to better, more complex or more intelligent organisms. There is no such thing as an evolutionary trend, even with the benefit of hindsight. ]
AwesomeGuy200|Points 1177|

User: 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.

Weegy: It means dolphins probably have an ancestor that had gills, but then evolved into a land animal. The fact that dolphins do not have gills is also good evidence that they evolved from a land animal. [ It also means that an ancestral character that was lost in evolution usually cannot re-evolve, even though there is a need for it. Animals and plants do not simply evolve traits that they need to survive. Some species simply had the good luck to possess traits that by chance allow them to adapt better to a new environment. In fact, many species became extinct because they simply did not have the good luck to have the traits that they desperately needed to survive. Evolution, therefore, does not, as some people may insist, inevitably lead to better, more complex or more intelligent organisms. There is no such thing as an evolutionary trend, even with the benefit of hindsight. ]
AwesomeGuy200|Points 1177|

User: Which of the following statements is true? Organisms that evolve in the same environment often have homologous structures. Since there are gaps in the fossil record, it cannot be used as evidence for evolution. Human morphology and embryo development is very different from all other organisms. The more similar the embryonic development of two species, the more closely they are related.

Weegy: The more similar the embryonic development of two species, the more closely they are related.
islandguy|Points 721|

User: Whales have vestigial legs. This suggests they _____. will one day return to land evolved from large fish descended from land animals can live on land

Weegy: The answer is C, descended from land animals.
MissEb|Points 105|

User: Comparative morphology _____. compares the embryo development of organisms of different species compares the anatomy of organisms of different species organizes fossils into a timeline of organism evolution analyses the similarities and differences between organisms of the same species

Weegy: I'm sorry, your answer would be D. analyses the similarities and differences between organisms of the same species.
MABOO11|Points 655|

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Asked 9/9/2012 12:31:17 PM
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