Q.1 Given the tree above, the similar body shape of Icthyosaurs and Dolphins is

Question

Q.1 Given the tree above, the similar body shape of Icthyosaurs and Dolphins is best described as:

  a. an example of convergent evolution

  b. a homoplasious trait

  c. both a and b

  d. neither a or b

Q.2:

Which of the following statements is central to the idea of uniformitarianism:

a. natural laws that are observable today also operated in the past

b. catastrophic events such as floods and volcanoes have played the primary role in shaping the earth’s existing features

c. geological change happens gradually for the most part

  a and c are correct

  all are correct

Explanation / Answer

Q1. c. both a and b

Both dolphins and ichthyosaurs have a similar, streamlined body shape that is very different from
the shape of their last common ancestor, it is an example of homoplasious trait and convergent evolution.

a homoplasious trait is referred to a trait present in a set of species but not present in their common ancestor. During convergent evolution y organisms not closely related, independently evolve similar traits as a result of having to adapt to similar environments or ecological niches

Q2. a and c are correct

natural laws that are observable today also operated in the past and  geological change happens gradually for the most part

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