Bromine is a trace element that is very closely related to its sister element Iodine, the one can often be mistaken for the other. It often was used a part of pesticides but as it causes ox one depletion is was banned. It is now used in anti-convulsion and anti-seizure drugs. As it is found in small amounts in ocean water, but also in high concentration in salt lakes, Krill is a good match. Krill isn’t really one species, but a series of different very small crustaceans of the order Euphausiacea. They do however seem almost diluted within the oceans they are so small.
Krypton might seem like its the weakness of superman (that was Kryptonite) it is in reality a inert gas, mostly free of radiation and unable to react with other elements unless under very specific circumstance. Like all of the noble gasses thus far Krypton is depicted as a bird. The kestrel is bird of prey that feeds often on small rodents and lizards and sometimes larger prey. I matched it with Krypton because they both start with the letter K.