Скачать или смотреть MAMMALIA with characteristics/ Sub classes/ Economic importance

I hope from previous videos you understood about PISCES, AMPHIBIA, REPTILIA, AVES and now today video will help you well to know about characteristics of advanced and last class of CHORDATA. it will give you detail about MAMMALIA

1. Main Characteristics for identification
i. Endothermic or Warm blooded
ii. Hairs on body
iii. Mammary glands
iv. laying of youn ones
2. Digestive sys.
3. Respiratory sys.
4. Circulatory sys.
5. Nervous sys.
6.Excretory sys.
7.Reproduction
8. Internal fertilization
9.Development

Sub classes of MAMMALIA ( old division)

1. Prototheria ( Egg laying mammals)Platypus
2. Metatheris ( Pouched Mammals) Kangaroo
3. Eutheria ( Placental Mammals) Cow, Human

Economic importance

1.From Mammals food will be availed as meat, milk
2. Wool and leather from skin
3. As transporter will be used like Camel, Horse and Donkeys
4. For research purpose RATS / MICE usually use
5. Good companions or pet of Humans like Dog and Cat