The animal such as birds have

1. Light bones with air cavities
2. Solid heavy bones
3. Heavy pointed bones
4. No bones

The biotic components of the environment includes

1. Green plants
2. Animals
3. Decomposers
4. All of these

The presence of hollow plant stems is a characteristic of

1. Desert plants
2. Aquatic plants
3. Mountainous tress
4. None of these

Slow breathing is the characteristic of

1. Desert Animals
2. Aquatic Animals
3. Aerial Animals
4. Land Animals