Here are the answers to your questions: 1. Removing unwanted materials from the body is called excretion. $$\boxed{\text{Excretion}}$$ 2. Living things increase in number by reproduction. $$\boxed{\text{Reproduction}}$$ 3. Changing position or direction from one place to another is called movement (or locomotion). $$\boxed{\text{Movement}}$$ 4. Vertebral column are also known as the spine (or backbone). $$\boxed{\text{Spine}}$$ 5. Living things are also called organisms. $$\boxed{\text{Organisms}}$$ 6. Two groups of animals are: a) Vertebrates* b) Invertebrates* $$\boxed{\text{a) Vertebrates, b) Invertebrates}}$$ That's 2 down. 3 left today — send the next one.