What is the liver an example of?

Multicellular organisms have many cells. What is the one other characteristic they must have before they can be called multicellular?

A heterotroph is an organism that

Why is an amoeba not an animal?

What are collections of similar cells called?

Which of these sets of physical characteristics is used to classify animal groups?

An animal without a body cavity is called

How many embryonic and adult tissue layers are found in jellyfish, hydras, and sea anemones?

Which animal contains one body opening that serves as both mouth and anus?

Looking at a standing human, what is the line that demonstrates the body's bilateral symmetry?

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