1—14 mounting empirical evidence suggests that many animal e

1—14 mounting empirical evidence suggests that many animal experiments are performed callously without any need to the discomfort or pain that laboratory mammals endure.
想问：
1—mounting empirical evidence suggests that：suggest翻译成建议吗?
2—are performed：翻译成被执行吗
3—without any need to the discomfort or pain：翻译成：没有任何不便或痛苦的需要吗?
4—that laboratory mammals endure.定语从句吗?
5— that many animal experiments are performed callously without any need to the discomfort or pain that laboratory mammals endure.我对句子的成分划分对吗?
在这个that引导的宾语从句中：主语是many animal experiments 想问的是：are performed callously 其中callously应该是adv
are performed是被动形式.谓语是are performed 后面的 without any need to the discomfort or pain是状语 那么后面的that laboratory mammals endure.又是个宾语从句.有点晕.