Question

2. Define/explain the following traits that are important adaptations for different types of vertebrate animals:

1. Jaws
2. Lungs
3. Tetrapods
4. Amniotic egg
5. Mammary glands

Answer 1

Jaw :-It is the extreme evolution advantages . Evolution on jaw allowed the jaw fishes to grasp and punctured the food and grind it with the help of teeth .

According to jaw hypothesis , jaw evolution is responsible for the adaptive immune system.

Lungs:- Modern reptiles emerged from water and become air breather. They are exothermic and capable for high physical activity. Modern reptiles are emerged in to forms 1) mammals 2) birds. Mammals are emerged from the carnivorous reptiles and birds are from theropod dinesours. Lungs make them to used air oxygen and circulate through out the body.

Tetrapods:- They are evolved around 400 million yr ago and categories as animals. These are those organisms which do not have midway foot segment and drag their body on the land. Some tetrapods are such as snake are without legs. These organisms change their body plan for breathing and navigate in water.

Amniotics egg:- These is the adaption to protect the embryo from desiccation and provide nutrient in its growth period from yolk sac .