Lesson 17

4. large, tasty fish with silvery scales and pink or reddish flesh that live in both salt water and fresh water
5. more than one thing that causes or increases action, feeling, or thought
6. two cubes marked with dots on each side that represent the numbers one through six that are commonly used in board games
8. more than one educated guess or a possible explanation for something you're trying to understand, usually in a science experiment
9. layers of rock or soil that are stacked on top of each other
11. more than one article of clothing that covers the area below the waist, reaching down as far as the feet and covering each leg separately
14. the identification of more than one disease by the examination of symptoms and signs and by other tests
15. tiny, one-celled living things, like little building blocks, that can be found almost everywhere on Earth
18. people who have attended or have graduated from a particular school, college, or university
19. more than one positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass
20. tools used for cutting that are made up of two blades that are joined so that their edges may be opened and closed

1. birds related to the chicken that live on the ground and is often hunted for sport and food
2. small shellfish with long legs and a long body that has a hard casing; often found in the ocean
3. regular oval shapes, traced by a point moving in a plane so that the sum of its distances from two other points (the foci) is constant
7. more than one big family of animals or plants that are grouped together because they share some important features
10. more than one main point or argument that an author makes in an essay or paper
12. organisms that live mainly in the water and make their food through photosynthesis; are different from plants because they have no true leaves, roots, or stems (example: seaweed)
13. the children or young of a particular human, animal, or plant
16. the plural form of a straight line "arm" that stretches from the very center of a circle to any point on its edge (the circumference)
17. more than one careful study of something, often by breaking it down into its parts