Biology Notes 3-31-08

Biology Notes 3-31-08 - Biology Notes March 31, 2008 The...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Biology Notes March 31, 2008 The Amniote Clade evolved several features that contribute to success on dry land. The Amniote Egg: -Leather or calcium shell reduces water loss -extra embryonic membranes hold water, wastes and allows for gas exchange -yolk provides nutrients for embryos -internal fertilization = mating Adaptations for Life on Land: -tough skin with keratin scales and other modifications -excretory organs (kidneys) allow excretion of concentrated nitrogen wastes -lungs for gas exchange, many groups with divided heart -limbs set under body to support weight and increase speed During Carboniferous Age -Amniotes split and formed two major groups -Reptiles: turtles, lizards, snakes, dinosaurs and birds -half of the living species are birds, which are the only living descendents of the dinosaurs -turtles have changed little in the last 250 million years -lizards and snakes are most abundant -endothermic: activity dependent on temperature -snakes lack legs, are carnivorous -lizards can be carnivorous or herbivores
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

Biology Notes 3-31-08 - Biology Notes March 31, 2008 The...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online