Answer:
the answer is lungs
Explanation:
All of the animals from frogs and up have and use lungs.
ANSWER: True
EXPLANATION: An inference is a logical conclusion based on observations.
Hope it helps u!
This is more to do with Bioaccumulation of mercury, where the mercury is absorbed into the issue of animals, and so animals higher in the food chain consume a lot of tissue matter hence increasing mercury content in their system.
I'm not sure about 2 but in 3 it would float
