Chordates part 2 - Chordates part 2 Chordates part 2...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chordates – part 2 Page 1 of 7 Chordates – part 2 Readings: Chapter 34, pp 712- 720 Self quiz questions: None for these sections Tetrapods started in previous notes 1. Evolution of limbs New material 2. Amphibians (clade Amphibia) (a) There are three groups (b) The skin has glands (c) Amphibians have one ear ossicles (d) Habitats can be quite variable (i) Most amphibians live in moist habitats because water movement occurs across the s k i n . (ii) Some have adaptations for living in arid areas. - Store water in bladder - Buries itself in sediment of a pond - Moves & hides in crevices & absorbs water from the bladder - Makes a cocoon - Waxy coat & drinks water (only anuran) (e) Most frogs lay eggs which develop into tadpoles
Background image of page 1

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

View Full DocumentRight Arrow Icon
Chordates – part 2 Page 2 of 7 (iii) Tadpoles metamorphose into adults (f) Some frogs have altered life cycles (g) Why are amphibian populations decreasing? (i)
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/15/2011 for the course BIOL 190B taught by Professor Dr.davidcreasey during the Spring '10 term at University of Victoria.

Page1 / 7

Chordates part 2 - Chordates part 2 Chordates part 2...

This preview shows document pages 1 - 3. Sign up to view the full document.

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