I look up cougars or any animal they all look the same? Like If i type on google as example of tiger i see multiple tigers of bengal tiger but when its two unrelated bengal tigers they look so munch alike. Why can't they look differently  Like me and my firend both humans but we have different facials and different hair styles and different lookig body but aniamls like bengal tiger or two dogs in same breed look so mucnh alike even though they not related to be siblings

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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I look up cougars or any animal they all look the same?

Like If i type on google as example of tiger i see multiple tigers of bengal tiger but when its two unrelated bengal tigers they look so munch alike.

Why can't they look differently 

Like me and my firend both humans but we have different facials and different hair styles and different lookig body

but aniamls like bengal tiger or two dogs in same breed look so mucnh alike even though they not related to be siblings

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Step 1

Although human beings vary widely in size, color, and looks, the genetic makeup of human beings is similar. The variations in size, color, and looks are a result of the different levels of expression of these traits. However, at the genetic level, humans have the same organization.

Causes of differences between individuals include independent assortment, the exchange of genes (crossing over and recombination) during reproduction (through meiosis), and various mutational events. 

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