Question

Show by an activity that air has oxygen
a. Which type of separation in used in cashew nut factories?
b. Can we obtain wood from saw dust?
c. What are fixed joints?
d. What are blowholes?

Answer 1

Dear student ,

c) A joint is the particular location where two or more bones get connected to each other. Most of the joints are movable like elbow, knee, hip joints etc. Some are fixed joins like skull. They do not allow movement but they are joints as several small bones get connected to each other to form the structure.

d) Whales and dolphins breathe air through their lungs like other mammals and therefore they have to come to the surface of water regularly. The nostrils of whales and dolphins are located at the top of their heads and are called 'blowholes' . They come to the surface or jump into the air regularly to inhale and exhale air through these blowholes.

Regards