175.　 His message was that black people should not be separated but should be treated with respect in the same way as other people.

174.　 By doing this he set an example to the rest of the world.

173.　 Estuaries also contribute to the economy through tourism and fishing.

172.　 An estuary is the body of water where a river meets the ocean.

171.　 The most important thing we can learn about water, however, is that we must protect it and use it wisely.

170.　 Water, which seems to simple and common, is what makes life possible.

169.　 The nutrients in whatever falls into the ocean quickly become available to other living creatures.

168.　 Life in the ocean ranges from the tiniest plankton all the way up to giants like sharks and whales.

167.　 His eyes, if eyes they may be called, looked at me.

166.　 I read all the books I could find that threw light upon these matters.