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由于人类对鸟资源的破坏，致使某处松树林内体色各异的松毛虫大量繁殖，对松林造成了毁灭性的影响，为此，人们向该松树林投放了大量人工饲养的喜鹊，使松毛虫的数量很快得到控制，拯救了松林．根据以上事实回答： （1）鸟类减少引起松毛虫增多，松林受害，是因为人类破坏了原有的______．投入喜鹊后松林恢复了生机，这是______得到了恢复． （2）树林内松毛虫体色各异，投放喜鹊后，体色与松树颜色相近的松毛虫有更多的生存机会，这叫______． （3）影响松毛虫生长的生物因素有______，非生物因素有______．题中描述了一条食物链是______．
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