Demography is the study of:

• world economic conditions
• mountains and other physical features on the landscape
• urban areas
• statistics related to the changing structure of human population

What is the approximate population of men age 65-69 in the US in 2014? (see pyramid)

• 7.5 million
• 10.5 million
• 5 million
• 12 million

Step in the food chain, food web, or ecological pyramid

• trophic level

• abiotic factors

• community

• ecosystem

A large area that has a specific type of climate and certain types of plant and animal communities 

• ecosystem
• habitat
• niche
• biome

Network of interconnected food chains in an ecosystem

• ecology

• food web

• decomposer

• food chain

Organism that feeds on animal and plant remains that did not capture; scavenger

• carnivore
• detritivore
• consumer
• species

Study of interactions between organisms and their environment 

• niche
• community 
• ecology
• ecosystem

Members of a species in a defined area

• Ecosystem
• community
• biodiversity
• population

Where an organism lives

• habitat
• niche 
• heterotrogh
• biosphere

Two organisms that are so similar they can interbreed in nature and produce fertile offspring

• biotic factor
• herbivore
• ecosystem
• species