A: a source that’s cited in another source
Answer: Human civilization has made many bad things, such as pollution.
Explanation:
Your answers would be C, E, H, I
Answer:
Peter and Anne fell in love. They cuddled and kissed in Peter's room and in the attic. But after a while Anne realised that Peter would never become the friend she had hoped for. She backed off a little, but Peter did not.
Explanation:
Answer:
The mechanisms used to produce sound vary from one family of cetaceans to another. Marine mammals, such as whales, dolphins, and porpoises, are much more dependent on sound for communication and sensation than are land mammals, because other senses are of limited effectiveness in water. Sight is less effective for marine mammals because of the particulate way in which the ocean scatters light. Smell is also limited, as molecules diffuse more slowly in water than in air, which makes smelling less effective. However, the speed of sound is roughly four times greater in water than in the atmosphere at sea level. As sea mammals are so dependent on hearing to communicate and feed, environmentalists and cetologists are concerned that they are being harmed by the increased ambient noise in the world's oceans caused by ships, sonar and marine seismic surveys.[2]
