Which best explains why both cats and humans are multicellular organisms? 

• They get energy from many food sources.
• They get energy from a single food source.
• They need only one cell to meet their basic needs.
• They need many cells working together to meet their basic needs.

Fungi and bacteria are both single-celled organisms. What do they most likely have in common?

• Both fungi and bacteria are large organisms.
• Both fungi and bacteria can carry out all life functions in their one cell.
• Both fungi and bacteria need sunlight and nutrients from the soil to be able to grow.
• Both fungi and bacteria are highly specialized to do only one job so they must work with other cells to obtain food.

How are multicellular and unicellular organisms different?

• Multicellular organisms have more than one cell and are smaller than unicellular organisms.
• Unicellular organisms have more than one cell and are larger than multicellular organisms.
• Unicellular organisms have one cell and are smaller than multicellular organisms.
• Multicellular organisms have one cell and are larger than unicellular organisms.

Fish are multi-celled organisms with specialized cells. What would most likely happen if their specialized cells did not function properly?

• The fish would decrease in size.
• The fish would increase in size.
• The fish would die.
• The fish would move to a different habitat.

An organism can only be seen through a microscope. Which is most likely true of that organism?

• It is a plant.
• It is an animal.
• It is multi-cellular.
• It is single-cellular.

How does an ant benefit from being a multicellular organism?

• Ants have one specialized cell that performs a variety of tasks necessary for life.
• Ants perform a variety of tasks to be able to survive so they need many specialized cells.
• Ants have one type of cell and this cell performs the same task to help them survive.
• Ants are small organisms but depend on only two different types of cells to help them survive.

How do the muscular and skeletal systems work together to help the body?

• They provide blood to the body.
• They provide nutrients to the body.
• They provide structure and movement for the body.
• They provide oxygen and carbon dioxide to the body.

Whitney accidentally touches a hot surface and then quickly pulls her hand away. Which two systems in the human body were involved with her action and reaction?

• nervous and muscular
• skeletal and circulatory
• nervous and respiratory
• muscular and respiratory

Which best describes the relationship between the skeletal system and the circulatory system?

• The skeletal system transports red blood cells after the circulatory system produces them.
• The skeletal system protects red blood cells and the circulatory system pumps those cells through veins and arteries.
• The skeletal system produces red blood cells and the circulatory system transports those cells where they need to go.
• The skeletal system helps put oxygen in red blood cells and the circulatory system helps those cells rid the body of carbon dioxide.

Which two human body systems work closely together to distribute nutrients from food throughout the body?

• muscular and skeletal
• digestive and circulatory
• circulatory and respiratory
• cardiovascular and digestive