The simplest level of organization in a multi-cellular organism is:

After cell, the next level of organization in a multi-cellular organism is:

After tissue, the next level of organization in a multi-cellular organism is:

The highest level of organization within a multi-cellular organism is:

Which of the following is an example of an organ system?

Which of the following is an example of an organ?

Which of the following is an example of a tissue?

Which of the following is an example of a cell?

When a plant breathes out, it releases what gas?

What gas do animals breathe out that plants need to perform photosynthesis?

What process do plants use to create their own food?

What is it called when animals breathe?

Why do we have a respiratory system?

What is the purpose of the circulatory system?

To make energy, our bodies need what gas?

When we breathe out, we get rid of:

Your circulatory system is NOT responsible for:

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