鸟吃螃蟹 问削弱。 B.Horseshoe crabs are so prolific that given favorable circumstances their numbers increase rapidly. E 螃蟹下蛋的数量还是什么跟螃蟹的密度有关(也就是说海滩变成原来两倍,螃蟹密度就小了)
鸟吃螃蟹 问削弱。 B.Horseshoe crabs are so prolific that given favorable circumstances their numbers increase rapidly. E 螃蟹下蛋的数量还是什么跟螃蟹的密度有关(也就是说海滩变成原来两倍,螃蟹密度就小了)