Interdepence of Organisms

Which of these terrestrial biomes receives less than 25 cm of precipitation annually? 

• Savannah
• Temperate Forest
• Desert
• Estuary

Cattle egrets are birds that forage in fields among cattle. The egrets get easy access to food and the cattle don't care if they are there or not.

• mutualism
• commensalism
• competition
• parasitism

Which organisms compete for the same food?

• Rabbits and mice
• Rabbits and foxes
• Mice and grasshoppers
• Grasshoppers and owls

A wrasse fish feeds on the parasites found on the black sea bass's body. Both species benefit. 

• Mutualism 
• Parasitism 
• Commensalism 

Which of the following is NOT a level of organization in ecosystems?

• community
• species
• population
• organism

An ecosystem is made up of all the ________________ and _________________ factors in an area.

• species and organisms
• abiotic and species
• biotic and species
• abiotic and biotic

A living or once-living organisms in an ecosystem is a

• population
• biotic factor
• abiotic factor
• community

A nonliving element in an ecosystem is an 

• animal
• abiotic factor
• biotic factor
• organism

The prefix bio means

• life
• science
• story
• not

The prefix a means 

• life
• science
• not or without
• one