The apparatus shown below was set up. Give explanations for the following observations.
stopper
white cloud
glass tube
O
cotton wool soaked
in concentrated
hydrochloric acid
cotton wool soaked
in concentrated
ammonia solution
a The formation of a white cloud.
b It took a few minutes before the white cloud formed.
c The white cloud formed further from the cotton wool
soaked in ammonia.​

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the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.

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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