Food chains

define producers

organisms making their own food

define primary consumers

animals that eat producers (herbivores)

define secondary consumers

animals that eat primary consumers (carnivore or omnivore)

define tertiary consumers 

animals that eat secondary consumers (predators) 

define decomposers

organisms that break down dead organisms and waste (such as bacteria and fungi)

what factors can increase a population of species in an area 

predators move away 

diseases that affect predators spread 

population of species in area adapts to deadly virus

what factors can decrease a population of species in an area

more predators move into an area

more competitors move into the area

habitat destroyed by construction

deadly virus in habitat

plouged habitat

define biomass

total dry mass of organisms in an area

define pyramid of numbers 

shows number of organissm at each trophic levelorganisms 

define pyramid of biomass

shows dry mass of population of organisms in an area at each trophic level 

why is not 100 percent of the energy given to the animal that has eaten something? 

respiration 

excretion 

not eating all of the animal/plant