Answer:
1)
Tissues in the intestinal tract made up of loose connective tissues
<em>Mucosa</em>: It playa a role in the secretion of lubricants that lubricate and protect the intestinal wall from digestive enzymes.
<em>Submucosa:</em> It contains nerves, blood vessels and elastic fibers with collagen. It maintains the shape of the intestine by stretching.
<em>Serosa: </em>During digestive movements, it secretes lubricating fluid and prevents from frictional damages.
2)
Accessory digestive organs have common specialized cells, ducts, and secrete digestive hormones to help in digestion.
3)
<em>Acinar </em>cells that secrete and <u>transport enzymes or bicarbonate into the duodenum for the digestion of the food.</u>
<em>Islet cells</em> that secrete insulin or glucagon that <u>increase the glucose level in the blood.</u>
<em>Blood vessels</em> provide<u> oxygen and nutrients for tissue growth and maintenance.</u>
4)
<em>Villi</em> help to <u>absorb digested food.</u>
<em>Smooth muscle</em> <u>moves food through the digestive tract.</u>
<em>Intestinal glands</em> help in <u>digestion and absorption by releasing hormones.</u>
D. The input of solar energy can be added
If the epimers differ in con²gura±on around one<span> carbon or more than one carbon</span>