Root Apical meristem

root  apical  meristem is a  thimble-like  root  cap,  which  protects  the  delicate  apical  meristem  as  the root  pushes  through  the  abrasive  soil

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#Id: 7037

#XL - T Zoology

Darwin’s evolutionary theory - Evolution as such is the simple proposition that the characteristics of organisms change over time. 

Geometric increase 

Limited food & Space

Struggle for existence 

Variation 

Natural selection

Inheritance of useful characters

Speciation 

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#Id: 7038

#XL - T Zoology

Darwin’s evolutionary theory - Common descent

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#Id: 7039

#XL - T Zoology

Gradualism is Darwin’s proposition that the differences between even radically different organisms have evolved by small steps through intermediate forms, not by leaps

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#Id: 7040

#XL - T Zoology

Populational change is Darwin’s hypothesis that evolution occurs by changes in the proportions (frequencies) of different variant kinds of individuals within a population.

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#Id: 7041

#XL - T Zoology

 Natural selection was Darwin’s brilliant hypothesis, independently conceived by Wallace, that accounts for adaptations, features that appear “designed” to fit organisms to their environment.

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#Id: 7042

#XL - T Zoology