7th Grade Lesson 18 Vocabulary

the reason an author decides to write about a specific topic

• author's theme

• author's purpose

• tone

• mood

forces water through membranes to filter out salts

• filtration

• reverse osmosis

• leeching

• decomposition

steadily lessening

• climbing

• dwindling

• rising

• down grade

capable of living

• viable

• independent

• symbiotic

• decomposing

(adj.) bare, dreary, dismal

• isolated

• optimistic

• disastrous

• bleak

A biological community of interacting organisms and their physical environment.

• ecosystem

• biome

• remote

• competing predators

(adj.) open to attack; capable of being wounded or damaged; unprotected

• competitive

• invincible

• vulnerable

• viable

the using up of a resource

• extinct

• renewable

• plentiful

• consumption

To support for an extended period of time

• independent

• dependent

• enabler

• sustain

co-workers, people who have the same career

• colleagues

• associates

• competitors

• cronies