Animal Diversity

• What don't have tissues (early diverging group)?

  Sponges
• Cnidarians are what type of symmetrical?

  Radially
• Bilatereians have a complete digestive tract
• The diversity of large organisms is due to the?

  Cambrian Explosion
• Bilateral animals have a CNS and are more active
• The body cavity acts as:

  -cushion (for organs)

  -Hydrostatic skeleton

  -internal organ independent movement
• Chordata is the only phylum with a vertebrae
• Anthropods then vertebrates colonized land during the cambrian explosion
• The snow goose improves the growth of plants at low population sizes through additions of nutrient-rich wastes. This transforms?

  Terrestrial Ecosystems
• milk producing, hair, fat layer under skin, high metabolic rate, different types of teeth are: mammals
• Birds are endothermic, reptiles are ectothermic
• Arthropods were the first to colonize land
• Insects declined during the cretaceous period
• What set of animals was first formed as a result of evolving lobe fins to feet and feet?

  Amphibians
• amniotes: reptiles, birds and mammals

  However the only living amniote is the mammal