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How long is the esophagus of a human being?

23-25 cm

10-14 cm

35-40 cm

50 cm

The esophagus, which passes food from the pharynx to the stomach, is about 25 cm (10 inches) 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.

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Qasim Zafar wikipedia → Esophagus

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31

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101

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9609

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102

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127

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21

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35

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27

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11

How do baby birds get oxygen inside their eggs?

They have a large oxygen supply from the start

Oxygen is created during protein reduction

Oxygen comes in through pores in the shell

They don't need oxygen at all

How deep is the root system of a giant sequoia?

4 meters (13 feet)

20 meters (60 feet)

40 meters (130 feet)

80 meters (260 feet)

How many chromosomes does a mule have? (A horse has 64, a donkey has 62)

It is infertile and does not have chromosomes

Which part of the heart does the aorta come from?

the left atrium

the right atrium

the left ventricle

the right ventricle