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.
Kasia
0
Correct this question
10
Very interesting!
reach: rather globalanimalsbiologybirdseggshard simple questionsnaturephysicszoology

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%
13%
63%
17%
135
flagSpain
11%
6%
61%
17%
62
flagMalaysia
4%
17%
60%
16%
74
flagBrazil
8%
17%
59%
10%
201
flagthe United States
6%
18%
58%
12%
1574
flagGermany
8%
16%
58%
15%
467
flagBelarus
10%
16%
58%
16%
100
flagPakistan
9%
16%
57%
14%
142
flagNigeria
3%
18%
57%
13%
76
flagthe United Kingdom
7%
18%
55%
16%
551
flagRussia
13%
13%
55%
14%
515
flagItaly
8%
16%
54%
16%
72
flagPoland
12%
17%
53%
14%
26577
flagCanada
11%
20%
52%
16%
105
flagIndia
5%
24%
51%
14%
1445
flagUkraine
17%
12%
50%
16%
601
flagSwitzerland
9%
11%
49%
27%
51
flagUnknown
6%
25%
48%
20%
75
flagKazakhstan
15%
20%
44%
17%
127
flagthe Philippines
9%
27%
43%
16%
151