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
7%
7%
77%
3%
53
flagPakistan
6%
16%
69%
5%
79
flagGermany
6%
13%
66%
11%
256
flagthe Netherlands
3%
15%
66%
14%
57
flagItaly
10%
6%
66%
16%
30
flagRepublic of Ireland
9%
13%
65%
11%
84
flagMalaysia
2%
16%
65%
16%
43
flagthe United Arab Emirates
2%
11%
64%
20%
34
flagUkraine
9%
11%
63%
14%
63
flagPoland
10%
14%
62%
12%
21877
flagthe United States
5%
17%
61%
12%
1392
flagthe United Kingdom
7%
16%
61%
13%
659
flagCanada
7%
13%
61%
17%
93
flagSingapore
9%
22%
61%
6%
31
flagIndia
4%
20%
59%
12%
625
flagNorway
7%
15%
57%
17%
52
flagSweden
9%
3%
56%
28%
32
flagthe Philippines
8%
16%
53%
17%
86
flagUnknown
12%
21%
51%
15%
399
flagAustralia
12%
21%
45%
20%
55

Gender

men56%
women60%
They have a large oxygen supply from the start
9%
8%
Oxygen is created during protein reduction
18%
17%
Oxygen comes in through pores in the shell
56%
60%
They don't need oxygen at all
15%
13%

Details

Author: Kasia
Illustration: Pietro Minari
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