1. Hipótesis

18. • Fotos 1, 2 y 3: morguefile.com
• 4 -http://images.cdn.fotopedia.com/flickr-4003251431-original.jpg
• 5- http://i.images.cdn.fotopedia.com/flickr-106022338-
original/Countries_of_the_World/America/Bolivia/Bolivia.jpg
• 6- http://images.cdn.fotopedia.com/flickr-3075776891-original.jpg
• 7 - http://images.cdn.fotopedia.com/flickr-3264970454-original.jpg
• 8- http://images.cdn.fotopedia.com/flickr-3611941261-original.jpg
• 9- http://images.cdn.fotopedia.com/flickr-138307480-original.jpg
• 10- http://images.cdn.fotopedia.com/flickr-314306369-original.jpg
• 11- http://images.cdn.fotopedia.com/flickr-5214430868-original.jpg
• 12- http://images.cdn.fotopedia.com/gene-773c00efc3532360446a192c1421b6fa-
original.jpg
• 13- http://images.cdn.fotopedia.com/flickr-6800823034-original.jpg
• 15- http://images.cdn.fotopedia.com/flickr-4299656318-original.jpg
• 16- http://images.cdn.fotopedia.com/flickr-3098598812-original.jpg