Question
Using various resources such as your schood library or the internet and discussions with your teacher, trace the evolutionary stages of any one animal, say horse.
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Answer
The continuous change of a character within an evolutionary lineage is termed as evolutionary trend. The number of trends in any lineage is therefore same as the number of characters evolving. The evolution of horses as evidenced by the fossils reveal a mumber of important trends. Careful studies of fossils of horse show that direction and speed of their evolutionary trend are subject to much variation The following list identifies the major evolutionary of horses:
(i) General increase (with occasional decrease) in size.
(ii) Progressive loss of toes
(iii) Lengthening of toes that are retained
(iv) Lengthening of limbs in general
(v) Enlargement of brain
(vi) Increase in height
(vii) Increase in the complexity of molar teeth and enlargement of the last two and eventually that last 3 premolars until they came to resemble molars.
(i) General increase (with occasional decrease) in size.
(ii) Progressive loss of toes
(iii) Lengthening of toes that are retained
(iv) Lengthening of limbs in general
(v) Enlargement of brain
(vi) Increase in height
(vii) Increase in the complexity of molar teeth and enlargement of the last two and eventually that last 3 premolars until they came to resemble molars.
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