Explain how animals in vertebrata are classified in to further subgroups.

vertebrates are further classified  in to subgroups on the basis of many conditions

1. on the basis of weather

  warm blooded and cold blooded

2. on the basis of skeleton

exoskeleton and exoskeleton

3.  on the basis of way of taking oxygen (respiratory organs.)

either through skin, gills or lungs

4. Number of chambers in heart.

5. The method of reproduction

on the basis of above criteria, vertebrates are divided in to many classes.

1) Pisces (fishes)-

2) Amphibia

3) Reptilia-

4) Aves (birds)-

5) Mammalia-

is this for the e2020 class

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.