Answers edited by Indrani R.

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• What are organisms that cannot make their own food and must obtain energy from external sources called?
  
• How do humans affect the phosphorus cycle?
  
• Question #d0577
  
• Question #d28ab
  
• Question #7e1af
  
• The theory of endosymbiosis describes the probable evolution of what type of cell?
  
• How do flatworms, roundworms, and segmented worms differ from each other?
  
• DNA is a macromolecule. How are nucleotides arranged in DNA?
  
• What did Charles Darwin observe in finch populations on the Galápagos Islands off the coast of South America?
  
• Alyssa finds an organism in her yard that is growing underneath an old fencepost? It lives in a very dark, moist environment on decaying leaves. It grows three inches tall within one week, and it is attached to the ground. In which kingdom should this org
  
• What is a Grizzly Bear's classification?
  
• What do plants and animals have in common?
  
• In the biosphere, what are some of the major abiotic factors that determine the distribution and types of plant communities?
  
• How are a mushroom and a humpback whale alike?
  
• What is the primary productivity of an ecosystem?
  
• Question #6eaf2
  
• What is the act of putting organisms into different slots called?
  
• Why would information on comparative embryology be useful to show that certain bones are homologous?
  
• Where are sperm produced?
  
• How do the nutrients from food get into the cell?