Answers edited by Asaf B.

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• How tall were the first land based plants?
  
• What would happen if photosynthesis stopped happening on Earth?
  
• Most plants incorporate carbon dioxide into sugar by means of a cycle of reactions called the?
  
• Question #fcd0d
  
• What are species that migrate or are accidentally introduced into an ecosystem called?
  
• Question #8dba9
  
• In what ways are club mosses, horsetails, and ferns similar in their reproductive processes?
  
• Question #59aae
  
• If a bird that eats grasshoppers moved to the prairie, how would this move affect the natural selection for grasshopper colour ( brown and green ) in wet years? in drought years?
  
• If a purple flower with the genotype #Pp # (P = purple ; p = white) self-pollinates, what is the ratio of purple offspring to white offspring?
  
• What is the difference between a food chain, a food web, and an energy pyramid?
  
• Question #473eb
  
• Question #62177
  
• How do you change #34/3# to a mixed number?