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III. Direction: Write TRUE if the statement is correct and FALSE if it is incorrect. 36. Mammals, fish, reptiles, amphibians, and birds are all vertebrates. 37. Invertebrates are animals without a backbone. 38. Plants and animals are biotic or living components in an ecosystem. 39. Water conservation is one way of protecting our ecosystem 40. You can help in protecting and conserving our environment if you help cut the trees and throw garbage in the river.​