If i am a fish and i get, for example, Ebola, and my little fishy immune system is strong enough to fight it off, then i can possibly develop a tolerance to the disease, and that will be passed down to my little fishy kids.

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yes

Explanation:

Yes

Explanation:

the immune system will churn out a variety of immune molecules to fight it off

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if your boyfriend is cheating on you, my best advice to you is to dump him, he's only going to drag you down. and if you do, don't fret there's plenty better that know how to treat a person right. i mean honestly, the whole point of a romantic relationship is love, and if you love someone you aren't going to cheat on them. i do believe in second chances, but why would he cheat in the first place? i personally feel that if someone cheats, they ruin any chance they wanted/had with you. i wish you the best of luck with this, hang in there.