Unit 2 review biology all

Crocodiles often allow small birds to enter their mouths to pick bits of food from between their teeth. What is their symbiotic relationship? 

• parastism
• mutualism
• commensalism

The first organism in most food chains is

• a herbivore
• a producer
• a decomposer

What is a producer; a living organism that makes its own food using light energy?

• autotroph
• heterotroph
• decomposer

A living organism that gets / eats its food.

• producer
• consumer
• decomposer

A group of one type of living organism. For example, a group of deer in a forest.

• community
• population
• ecosystem

A consumer; a living organism that needs to eat food to gain energy.

• autotroph
• heterotroph
• decomposer

A living organism that breaks down waste or decaying material in order to get nutrients to stay alive.

• autotroph
• heterotroph
• decomposer

Triangles in the energy pyramid get smaller because.

• The organism's habitat area is smaller 
• Energy is lost as it moves up through the food chain