Which of these is the smallest?

A picture shows parts of the human body that work together to help the body digest food. What can you conclude about the tongue from this diagram?

Eugene drew a picture of the different levels in an animals structure at the top of the pyramid he put the animal’s body. The level of organization that is least specialized will be at the bottom. Which should he put at the bottom?

Gerard listed four levels of structural organization within multi-cellular organisms. He listed them in order from the smallest structure to the largest structure. Which of the following lists is correct?

The endocrine system of the human body releases molecules, called hormones, into the bloodstream to regulate body processes. Molecules, like hormones, are made up of which of the following?

Humans and other complex organism have a hierarchical system of organization. Which of the following statements is true regarding this system of organization?

Epithelial tissue covers the entire surface of many organisms. Which term describes the structure directly below tissues in the hierarchical organization of life?

Which of the following is always considered part of a scientific investigation?

Dimitri decides to test how the amount of nutrient called phosphorus affects tomato plant growth for his science fair project. Which of the following represents the test, or independent variable?

What is the variable that records what you are measuring in an experiment?

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