ECOSYSTEMS

Which statements about food webs is true?

• they consist of non-overlapping food chains
• they consist of all over-lapping food chains.
• they are very simple 
• they show what % of energy is lost

At the top level of the energy pyramid is:

• the least amount of energy 
• the most amount of energy 
• only producers
• about 90% of all energy 

A group of living things and their physical surroundings is a:

• food web
• food chain 
• biosphere 
• ecosystem 

Photosynthesis requires which of the following materials?

• sunlight 
• carbon dioxide 
• water 
• all of these 

For any species population is limited mainly by?

• food 
• space 
• food and space 
• none of these 

An invasive species:

• competes with native species 
• may have no natural predators
• may negatively affect native species
• all of these

The largest type of organisms in the environment are?

• autotrophs
• carnivores 
• herbivores 
• omnivores 

An interaction in which species live together over a long period of time and at least on benefits is called?

• parasitism
• symbiosis 
• biotic
• none of these 

All of the same species in an area is called?

• a population 
• community 
• biosphere 
• ecosystem 

A raccoon eats both plants and animals and would be called a? 

• producer
• herbivore 
• carnivore 
• omnivore