What are some of these statistics, and what is their function in the document? Interpret How are key ideas refined with clear and concise language in the
section "What Are Our Demands? What purpose does this section serve?

Which of the following statements is true? tissues are less complex than the organs they form. organs must be made of the same type of tissue. a group of related cells working together is called an organ. organs are less complex than the cells they are made from.