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
Directly under the shell, there is a small pocket of air. The mi­cro­scop­ic pores on the egg surface allow the CO2 to escape and fresh air to get in, so a de­vel­op­ing bird can breathe.

Answers distribution

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
answers
flagSpain
0%
12%
80%
8%
25
flagFrance
2%
9%
79%
4%
43
flagPakistan
3%
14%
74%
4%
63
flagItaly
7%
3%
69%
19%
26
flagDenmark
3%
15%
69%
11%
26
flagthe Netherlands
2%
16%
68%
14%
50
flagRepublic of Ireland
10%
10%
67%
10%
73
flagthe United Arab Emirates
3%
7%
67%
21%
28
flagGermany
6%
13%
65%
12%
220
flagMalaysia
2%
19%
63%
13%
36
flagSingapore
9%
18%
63%
9%
22
flagthe United States
5%
17%
61%
13%
1249
flagIndia
4%
20%
61%
10%
512
flagPoland
10%
14%
60%
12%
16855
flagthe United Kingdom
7%
18%
58%
14%
506
flagCanada
8%
14%
58%
17%
78
flagthe Philippines
8%
17%
53%
16%
79
flagNorway
7%
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53%
15%
39
flagSweden
11%
3%
51%
29%
27
flagAustralia
12%
21%
44%
21%
47

Gender

men58%
women60%
They have a large oxygen supply from the start
9%
8%
Oxygen is created during protein reduction
17%
16%
Oxygen comes in through pores in the shell
58%
60%
They don't need oxygen at all
14%
14%

Details

Author: Kasia
Illustration: Pietro Minari
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