3个BIOLOGY 问题 急!!!

1.兔子先是被这种病毒致死，因为它体内没有抗体。后来这种病毒对兔子的毒性减弱，是因为兔子体内产生了抗体。从免疫方面回答就可以了。
2.这是一种寄生关系，并不是互利共生。因为兰花寄生在树上，跟树争夺阳光，汲取营养。而它自己本身并不给树什么好处，是一种完全的索取者，这种关系就是寄生。
3.可以。解释有很多，举几个例子就可以了，比如牛和马就在同一级，它们是不同的种类

answer in Chinese or English?

1自然选择，兔子的抗病性增强，而且病毒的毒力减弱。因为病毒不会将它们的寄主全部杀死，否则它们也只有死掉了。
2寄生 但兰花并不与树争夺阳光，它们只是靠寄生根吸收植物的营养。
3两个物种可以占据同样的生态位么？这要看环境，如果环境中的资源很丰富，他们之间没有竞争，当然就可以共存了。如果资源是限制因子，那么它们就不可以共存。其实自然界的竞争没咱们想象的大，很多物种之间的竞争都很小。
你找个翻译软件翻译以下吧 。
3楼是用软件翻译的我的回答。

1自然选择，兔子的抗病性增强，而且病毒的毒力减弱。因为病毒不会将它们的寄主全部杀死，否则它们也只有死掉了。
2寄生 但兰花并不与树争夺阳光，它们只是靠寄生根吸收植物的营养。
3两个物种可以占据同样的生态位么？这要看环境，如果环境中的资源很丰富，他们之间没有竞争，当然就可以共存了。如果资源是限制因子，那么它们就不可以共存。其实自然界的竞争没咱们想象的大，很多物种之间的竞争都很小。

1 There are two reasons.The first one is natural choice.The virus picked out the rabbits with a strong resistance.The percentage of "strong" rabbit increased.The second one is immuse of the rabbit is strenghened.
2 Parasitic but not with the orchid tree for sunlight, they only rely on the parasitic plant roots absorb nutrients.
3 Two species can occupy the same niche .This depends on the environment, if the environment is very rich in resources, not competition between them, of course, can coexist on the same environment. If resources are limiting factors, then they can not coexist. In fact, the competitive nature did not Let's imagine, a lot of competition between the species are very small.

1.A natural choice, rabbits strengthen the resistance, but the virulence of the virus weakened. Because the virus will not kill all their host, otherwise they only died.
2. parasitic but not with the orchid tree for sunlight, they only rely on the parasitic plant roots absorb nutrients.
3. two species can occupy the same niche Mody.This depends on the environment, if the environment is very rich in resources, not competition between them, of course, can coexist on the. If resources are limiting factors, then they can not coexist. In fact, the competitive nature did not Let's imagine, a lot of competition between the species are very small.