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  3. Unit 4. evolution and the
  4. Diversity of life
  5. Introduction

Introduction

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Photo shows a bee collecting nectar from a flower.
Although they look different, this bee and flower are distantly related. (credit: modification of work by John Beetham)

This bee and Echinacea flower could not look more different, yet they are related, as are all living organisms on Earth. By following pathways of similarities and differences—both visible and genetic—scientists seek to map the history of evolution from single-celled organisms to the tremendous diversity of creatures that have crawled, germinated, floated, swam, flown, and walked on this planet.

Questions & Answers

discuss how the following factors such as predation risk, competition and habitat structure influence animal's foraging behavior in essay form
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Explain the following terms . (1) Abiotic factors in an ecosystem
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Abiotic factors are non living components of ecosystem.These include physical and chemical elements like temperature,light,water,soil,air quality and oxygen etc
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passive process of transport of low-molecular weight material according to its concentration gradient
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Pathogens and diseases
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Source:  OpenStax, Concepts of biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11487/1.9
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