What kind of nuclear reaction is seen in 239U BaKr +3,'n (on = neutron)? A. Nuclear fusion
B. Nuclear fission
C. Alpha decay
D. Beta decay

i wish i could but this one is weird give me abc and i can solve it.

the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

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