| 1 | You can work on them as they relate to learning and memory or host defense mechanisms. | |
| 2 | And all provoke the host's immune system into activity, which diverts resources from other things. | |
| 3 | Dodder can reduce agricultural productivity and can render a seed crop unmarketable since it's hard to separate it from its host plant. | |
| 4 | 以上这些原因还不算真正的奇怪。除了人类之外，弓形虫还有两种典型的寄主：啮齿动物和猫科动物。那些感染弓形虫的啮齿动物才真叫古怪。 Nor is any of this truly surprising. For, besides humans, Toxoplasma has two normal hosts: rodents and cats. And what it does to rodents is very odd indeed. | |
| 5 | The team also compared the masses of the black holes with the total masses of their host galaxies to determine how much matter they had swallowed. |
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