<span>The wall of the alimentary canal is composed of four basic tissue layers: mucosa, submucosa, muscularis, and serosa.</span>
The Answer To This Question Is C.
I do not get it can you explain any better
There are .................... of AMINO ACIDS which join together ........................
Amino acids are the building units of protein. There are basically twenty different types of amino acids which are divided into two classes of essential and non essential amino acids based on their requirements in human nutrition. These amino acids joined together in different manner to form different types of proteins.
B is the answer I strongly believe