In Exercises 8386, use the given information to write an equation. Let x represent the number described in each exercise. Then solve the equation and find the number. When one-third of a number is added to one-fifth of the number, the sum is 16. What is the number?

Exam 3 Study Guide 1. What is a taxon 2. What is a monophyletic group 3. Nearly all animals evolved during which time period 4. List the characteristics of animals. 5. What unicellular sister group did animals evolve from 6. Describe the differences between protostome and deuterostome development. 7. All animals are known as what 8. What is the deﬁning characteristic of eumetazoans 9. The most diverse animal phyla have . 10. Bilateral symmetry evolved around the same time as . 11. Name the 3 major clades of bilateria and describe each one. 12. What are the “big 9” animal phyla (also name the organisms in each one) 13. Describe the body plan of mollusks. 14. What is a common characteristic of all members of the c