questionedithistorytranslations

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.
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Answers by country

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
flagAustralia
5%
16%
60%
18%
105
flagBelarus
11%
9%
60%
17%
51
flagRussia
13%
11%
59%
13%
198
flagMalaysia
3%
15%
59%
19%
57
flagBrazil
9%
13%
58%
15%
51
flagthe United States
6%
19%
57%
13%
1402
flagGermany
5%
18%
56%
18%
160
flagCanada
11%
15%
56%
16%
78
flagPakistan
10%
16%
55%
16%
118
flagthe United Kingdom
8%
19%
54%
15%
434
flagPoland
12%
18%
53%
15%
24257
flagNigeria
4%
19%
53%
9%
41
flagIndia
5%
25%
51%
14%
1195
flagSingapore
8%
34%
51%
5%
35
flagUnknown
6%
25%
48%
20%
75
flagGreece
8%
32%
47%
11%
34
flagUkraine
20%
13%
46%
17%
259
flagthe Philippines
8%
27%
45%
16%
125
flagthe United Arab Emirates
5%
18%
42%
23%
38
flagKazakhstan
23%
23%
30%
20%
39

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