Middle School Science Review 7

A community of living and nonliving things in their natural environment makes up a(n)_______________

• food web
• ecosystem
• food chain
• carbon cycle

Only ____% of the Earth's water is fresh water.

• 90%
• 97%
• 3%
• 50%

What role in an ecosystem is this organism?

• producer
• primary consumer
• secondary consumer
• decomposer

An organism that gets energy from eating other organisms is a ______________

• producer
• consumer
• decomposer

What is the independent (changed) variable in this question?
What affect will the shape of the airplane's nose have on the distance it flies?

• shape of nose
• distance it flies
• type of paper
• room temperature

What is the first thing scientists do when starting the scientific method?

• test their hypothesis
• make observations
• conduct an experiment
• write down their results

A _____________ is a blood vessel that returns blood to the heart.  

• vein 
• artery 
• capillary 

The ___________________ is the organ in which most digestion takes place. 

• small intestine
• large intestine
• gall bladder
• liver

_______________ blood cells carry oxygen to body cells and carbon dioxide away from body cells. 

• Red
• White
• Gray
• Blue

This system sends chemical messages (hormones) that regulate growth, development, and metabolism.

• endocrine
• nervous
• immune
• skeletal