Which is the weakest bronsted base? a)cf3ch2s b)ch3ch2nh^- c)ccl3ch2ch2o^- d)ch3ch2^-

Bronsted base means proton or hydrogen ion acceptor.

The more negative the compound is the more is the chance of accepting hydrogen ion.

B, C and D are negatiave
While is A is neutral. SO it is the weakest

Crust,mantle,core,earth

The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.