A. Abrasion
Reason - cause by scraps on rough surface which breaks skin on outer layer.
Answer:
The nitrogen gas must be changed to a form called nitrates, which plants can absorb through their roots. The process of changing nitrogen gas to nitrates is called nitrogen fixation. It is carried out by nitrogen-fixing bacteria. The bacteria live in soil and roots of legumes, such as peas.
The temperature is equal in both.
Hope this helps!
B) Cell wall
The cell wall is a structure important cell protection and shape. It is necessary for the survival of unicellular organisms
