Science: Living Things Need Air

Websites for Question 1:

1. http://www.geocities.com/aquarium_fish/how_fish_breathe.htm

2. http://encarta.msn.com/media_461517509_761577180_-1_1/How_Fish_Breathe.html

3. http://www.petplace.com/fish/how-do-fish-breathe/page1.aspx

Websites for Question 2:
1. http://bio.edu.ee/animals/Imetajad/imalgus.htm

2. http://science.howstuffworks.com/question643.htm

3. http://en.wikipedia.org/wiki/Marine_mammal

OPTIONAL
1. http://www.saburchill.com/chapters/chap0025.html

2. http://www.yale.edu/ynhti/curriculum/units/2000/6/00.06.02.x.html