Rachel counted all the earthworms in a square meter in her back yard and found she had 36. She went back a week later and found she had only 30.Rachel knew that this was far too few to maintain her lawn

Rachel counted all the earthworms in a square meter in her back yard and found she had 36. She went back a week later and found she had only 30.Rachel knew that this was far too few to maintain her lawn so she decided to study the population for a couple of weeks. She found there were 9 worms born per week and 5 died per week. She also found 10 left for a nearby plot of land and 8 worms came from nearby plots during that week. Was the population growing or shrinking

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Rachel counted all the earthworms in a square meter in her back yard and found she had 36. She went back a week later and found she had only 30.Rachel knew that this was far too…

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