(A) According to the evolutionary history of life on Earth,about $200$ million years ago,some land-dwelling reptiles returned to the water to evolve i

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(A) According to the evolutionary history of life on Earth,about $200$ million years ago,some land-dwelling reptiles returned to the water to evolve into fish-like reptiles.These specific reptiles are known as Ichthyosaurs.Tyrannosaurus rex was a large land-dwelling dinosaur that existed much later,around $65$ million years ago.Therefore,the correct option is $A$.

Class 12 Biology Evolution Mix Examples- Evolution

Medium

About $200$ million years ago,some land reptiles went back into water to evolve into fish-like reptiles. These reptiles were known as:

A
$200$ million,Ichthyosaurs
B
$65$ million,Ichthyosaurs
C
$200$ million,Tyrannosaurus rex
D
$65$ million,Tyrannosaurus rex

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Class 12

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Evolution

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Mix Examples- Evolution

Which one of the following is known as the age of amphibians,fishes,and invertebrates?

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Match the columns:

Column-$I$ Column-$II$

$(1)$ Mutation $(a)$ Change in population allele frequencies due to chance alone.

$(2)$ Gene flow $(b)$ Difference in survival and reproduction.

$(3)$ Natural selection $(c)$ Immigration,emigration change allele frequencies.

$(4)$ Genetic drift $(d)$ Source of new alleles.

Column-$I$	Column-$II$
$(1)$ Mutation	$(a)$ Change in population allele frequencies due to chance alone.
$(2)$ Gene flow	$(b)$ Difference in survival and reproduction.
$(3)$ Natural selection	$(c)$ Immigration,emigration change allele frequencies.
$(4)$ Genetic drift	$(d)$ Source of new alleles.