You already know that the biotic (living things) and abiotic (non-living things) elements in an ecosystem are related.

There are 5 relationships between biotic and abiotic elements, and they can be positive, negative or neutral for the organisms.

Let's study them!!

PREDATION

It happens when an organism hunts and eats other organism. The hunter organism is the predator, and the hunted organism is the prey.

This relationship is positive for the predators and negative for the preys.

Examples: a lion eating a zebra, a snake eating a mouse, an elephant eating some leaves,...



MUTUALISM (COOPERATION)

It happens when organisms cooperate and they get a benefit from this cooperation.

This relationship is positive.

Examples: a bee and a flower, a woodpecker and a tree (woodpeckers will eat harmful insects for the tree),...

COMPETITION

It happens when organisms compete for the resources (food, shelter, water,...).

This is a negative relationship as the organisms harm each other.

Examples: animals compete for water in deserts, frogs and lizards compete for insects,...


COMMENSALISM

It happens when an organism gets a benefit from another organism, and the second organism is not affected by this relationship.

This is a positive relationship for the first organism and a neutral relationship for the second organism.

Examples: birds living on trees, vultures and lions (vultures eat what lions can't eat),...

PARASITISM

It happens when an organism gets a benefit but another organism is harmed.

This a positive relationship for the first organism and a negative relationship for the second organism.

Examples: fleas and dogs, mosquitoes and humans,...



As there are 5 relationships in ecosystems, we are going to watch 5 videos.


PREDATION




MUTUALISM (COOPERATION)




COMPETITION




COMMENSALISM




PARASITISM





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