Which is NOT a parasitic relationship?     The Dutch elm disease fungus infects and kills elm trees.     The trichina worm burrows into muscle tissue, forms a cyst, and waits to continue its cycle until a predator consumes the host.     A female tick fastens to the skin of a human host and draws blood for nutrition to make her eggs.     Unsightly dandelions sprout in a yard and outcompete with the fescue grass for sunlight.

Which is NOT a parasitic relationship?
   
The Dutch elm disease fungus infects and kills elm trees.
   
The trichina worm burrows into muscle tissue, forms a cyst, and waits to continue its cycle until a predator consumes the host.
   
A female tick fastens to the skin of a human host and draws blood for nutrition to make her eggs.
   
Unsightly dandelions sprout in a yard and outcompete with the fescue grass for sunlight.

 

What is a name for a group of different populations interacting together?
   
a population
   
a community
   
an ecosystem
   
biosis

 

Two different species in a particular ecosystem share the same niche. What is most likely true about these two species?

   

They are the result of an allopatric speciation event

   

They compete intensely 

   

One is a predator, the other its prey

   

They are the result of a sympatric speciation event

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