The esophagus, which passes food from the pharynx to the stomach, is about 25 cm(10 inches<span>) in length; the width varies from 1.5 to 2 cm (about 1 inch). The esophagus lies behind the trachea and heart and in front of the spinal column; it passes through the diaphragm before entering the stomach.</span>
Answer: E). Both b and d
Explanation:
Operant behaviour or conditioning which is also known as Instrumental conditioning is a type of learning process in which the strength of an organism or individuals behaviour is modified by punishment or reinforcement either positively or negatively.
Operant behavior is said to be "Voluntary" because the responses of the organism are under its control.
Answer:
a) provides structure to the Trachea. b) hairs on a cell that help it move around. C) Exchanges oxygen and carbon dioxide molecules to and from the blood stream
It’s has cell wall to keep it safe
