A rigid cell wall is found in plants so they can hold themselves up.
As far as I know, only the 3rd step, from all the mentioned above occur during meiosis I.
Hope it helped,
Happy homework/ study/ exam!
Answer:
The body has two lines of natural defense to protect against infection. The first are physical barriers, such as the skin, body secretions and mucous membranes. The second line of defense is the immune system. Specialized immune cells coordinate and execute attacks to kill germs that make it past the body's physical barriers.
I would need to see what is labeled b, in order to help you.
