As the water that collects in the bottom of the nest evaporates，the water vapor rises and is heated by the incubating bird，which adds significant humidity to the incubation environment.
(as从句)
当聚集在巢底的水蒸发时，水蒸气上升并被正在孵卵的鸟加热，于是为孵化环境增加了较大的湿度。
分句1：As the water that collects in the bottom of the nest evaporates
分句2：the water vapor rises
分句3：the water vapor is heated by the incubating bird
分句4：which adds significant humidity to the incubation environment.
2和3并列
1和2，3并列，1是2，3的条件
4和1，2，3嵌套，非限定性从句引导词which代表1，2，3
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