It 【主句形式主语】is【系动词】 significant 【表语】that the earliest living things {that built communities on these island }【定语从句】are examples of symbiosis【主句的真正主语,{主语从句}】.
请帮我分析下这个句子,就是它的成分,
It 【主句形式主语】is【系动词】 significant 【表语】that the earliest living things {that built communities on these island }【定语从句】are examples of symbiosis【主句的真正主语,{主语从句}】.