By Of all the mysteries in the world, none has been as popular as that of the Loch Ness Monster. Perhaps the biggest Loch Ness is a lake in Scotland. The loch, or lake, is known for sightings of a mysterious monster. Most who see th "monster" is moving in these sightings, and sometimes it is still. Many have suggested that Nessie might be a plesi The plesiosaur theory presents several problems. First, the plesiosaur is an air breather. Such a creature would nes since the last ice age. Today's creature would have to be the offspring of an original plesiosaur trapped long ago. Th this were the case. So from a purely logical stand point, the existence of such a large and ancient creature is unlikely. But assume for a • Tropical waters: Scientists believe plesiosaurs were warm-blooded. Like crocodiles and alligators, plesiosaurs Celsius). Food: Like other warm-blooded creatures, plesiosaurs would need a large quantity of food. If there is a group of the deepest areas. So the food chain, which would depend on plankton, is very weak at its base. As a result, the However, the plesiosaur theory is not the only one. Many other ideas attempt to explain the sightings and "photograp survey', completed in 2007 by the British Broadcasting Company (BBC), involved 600 different sonar beams. Using With cell phones and digital cameras, one would think that sightings of Nessie would increase. This has not happene the team used a fence post, raising it before groups of tourists. Afterwards several of the tourists asked to draw pictum 1 "BBC 'proves' Nessie does not exist." 27 July, 2003. http://news. bbc. co. uk/2/hi/science/nature/3096839.stm Which best summarizes the results of sonar surveys? A The simple tools cannot search at depths where the creature lives.
B The satellite navigation could not map the entire lake bottom.
C There are too many large salmon in the loch to find much else.
D They have found no evidence of anything bigger than a salmon.