Food pyramid, food chain

Abiotic conditions of life on Earth are made up by:
1. inanimate nature
2. components of animate nature
3. living organisms and their environment
The population of the blackbird icludes
1. all individuals of this species that live in a given place at a given time
2. all individuals of this species
3. only all adults who live in a given place and at a particular time
Populations in the community are bound to each other:
1. through food relations
2. through food (processing) relations
3. through neighbourly relations
On the basis of food relations we divide organisms:
1. producers, consumers, decomposers
2. makers, consumers, producers
3. producers, higher order consumers and decomposers
Producers are:
1. autotrophic organisms
2. saprophytic organisms
3. heterotrophic organisms
According to the types of organisms that contribute to the structure of the food chains we distinguish:
1. grazing and disruptive food chain
2. grazing and pray food chain
3. decompositional and disruptive food chain
First order consumers are not:
1. herbivores
2. soil organisms
3. birds of prey
In food chains:
1. must be all three types of organisms (herbivores, consumers, decomposers)
2. not always are all three types of organisms (herbivores, consumers, decomposers
3. may not be producers
In the upper floors of the food pyramid, the concentration of pollutants:
1. increases.
2. decreases
3. increases or decreases, depending on the circumstances
At the top of the food pyramid are:
1. consumers
2. first order consumers
3. herbivores