Frog Life Cycle

Study the frog life cycle diagram. Then answer the questions below. If you need help, review your textbook. Print this page out to write your answers on.

1. Describe what is occurring during each change.
   1. 
      

      ---

      
      

      ---

   2. 
      

      ---

      
      

      ---

   3. 
      

      ---

      
      

      ---

   4. 
      

      ---

      
      

      ---

   5. 
      

      ---

      
      

      ---

2. The word amphibian means "double life." Explain how that relates to the frog's life cycle.
   
   

   ---

   
   

   ---

   
   
3. Scientists consider amphibians good indicators of environmental change. Based on an amphibian's life cycle, think of a reason why that might be so.
   
   

   ---

   
   

   ---

   
   

   ---

Check your frog life cycle answers.

Why do Amphibian Declines Matter?

How do scientists explain the decline of many different kinds of amphibians? Find out some possible reasons by researching this problem on the Web. In your own words, describe the four main reasons that the declining amphibian population is important to us.

The following key words will help you gather information:
amphibian declines
amphibian malformations
amphibian diseases
amphibian research

Tips for an Effective Internet Search

1. Be aware that Search engines present pages in descending order of relevancy; the most useful pages will be at the top of the list.
2. To help determine whether the Web page is a reputable source, note the URL endings. Sites ending in .edu are maintained by educational institutions, sites ending in .gov are maintained by government agencies, sites ending in .org are maintained by nonprofit organizations, while sites ending in .com are commercially or personally maintained.
3. Be sure to respect copyrighted material.