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
flagFrance
6%
6%
77%
5%
58
flagDenmark
2%
14%
73%
8%
34
flagRepublic of Ireland
7%
10%
70%
11%
112
flagthe Netherlands
5%
12%
68%
13%
74
flagMalaysia
2%
14%
68%
14%
47
flagSwitzerland
7%
20%
67%
5%
40
flagGermany
6%
14%
66%
12%
299
flagUkraine
8%
10%
65%
14%
78
flagPakistan
7%
16%
64%
8%
89
flagCanada
6%
12%
63%
16%
102
flagPoland
10%
14%
62%
12%
26318
flagthe United Kingdom
7%
15%
62%
13%
772
flagthe United Arab Emirates
5%
12%
62%
17%
40
flagthe United States
5%
17%
61%
12%
1506
flagNorway
8%
14%
59%
15%
57
flagSweden
8%
6%
59%
24%
49
flagIndia
5%
21%
57%
12%
783
flagthe Philippines
8%
19%
50%
16%
110
flagAustralia
11%
18%
49%
21%
71
flagUnknown
12%
20%
48%
17%
908

Gender

men53%
women59%
They have a large oxygen supply from the start
11%
8%
Oxygen is created during protein reduction
19%
18%
Oxygen comes in through pores in the shell
53%
59%
They don't need oxygen at all
16%
13%

Details

Author: Kasia
Illustration: Pietro Minari
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