Changes

===Notes for teachers===

===Notes for teachers===

''These are short notes that the teacher wants to share about the concept, any locally relevant information, specific instructions on what kind of methodology used and common misconceptions/mistakes.''

#'''Fishes are the first to evolve as vertebrates'''

#Fishes are the first to evolve as vertebrates

#'''They complete their life cycle only in aquatic medium,hence they use gills for respiration and fins for locomotin in water and have gelatinous scales for easy gliding in water.'''

#They complete their life cycle only in aquatic medium,hence they use gills for respiration and fins for locomotin in water and have gelatinous scales for easy gliding in water.

#'''Two chambered heart facilitates one way blood circulation,so that oxygenated and deoxygenated blood circulates in a common channel.'''

#Two chambered heart facilitates one way blood circulation,so that oxygenated and deoxygenated blood circulates in a common channel.

#'''They are stenothermal and can adapt to wide range of temperature.'''

#They are stenothermal and can adapt to wide range of temperature.

#'''Both fertilization and foetus development are external ,and are unisexual.'''

#Both fertilization and foetus development are external ,and are unisexual.

===Activities===

===Activities===