Chordata classes

Question 1

Fish

Answer 1

• body covered with scales made from bony plates in skin
• external fertilisation
• ectothermic
• breathe through gilled covered in operculum

Question 2

amphibians

Answer 2

• moist skin, permeable to gases and water
• external fertilisation –> lay eggs. larval state in water, then adult often come to land
• breathe via skin, but also have simple lungs
• ectothermic

Question 3

Reptile

Answer 3

• covered in scales made of keratin
• internal fertilisation –> lay soft eggs
• ectothermic
• breath through lungs w extensive folding

Question 4

birdos

Answer 4

• endothermic
• breathe through lungs w parabronchial tubes
• skin covered with feathers, made of keratin
• internal fertilisation, females lay hard eggs

Question 5

Mammals

Answer 5

• Endothermic
• internal fertilisation, feed young milk from mammary glands
• skin covered in follicles with produce hair made of keratin
• lungs w alveoli