In the figure below,which letters represent the crest and trough? 
Definitions:
Digestive System
The complex series of organs and glands responsible for the digestion, absorption, and processing of food.
Circulatory System
The body's system responsible for moving blood, nutrients, gases, and wastes to and from cells, helping to fight diseases and stabilize body temperature and pH.
Pancreas
A glandular organ in the digestive and endocrine systems of vertebrates that produces hormones and digestive enzymes.
Placenta
An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to the growing fetus while removing waste products.
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