Ecologically equivalent to placental mammals

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a) In a few sentences, describe how Darwin explained the abundance of marsupials in Australia that were ecologically equivalent to placental mammals elsewhere. Do NOT refer to any information that was learned after the publication of On the Origin of Species in 1859.

b) Tetras are a diverse group of tropical freshwater fish. A species found in caves lacks eyes. The eyeless species is believed to have evolved from an ancestor that had eyes. Explain how natural selection can account for the loss of eyes in cave tetras.

c) Prokaryotic microbes resembling bacteria are discovered on Mars. They they use the same genetic code to make proteins as bacteria on Earth. What is the most likely explanation for why the genetic codes are the same?

Reference no: EM132581875

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