As Coach Pena walks through the forest after a rainstorm, he notices bubbles forming in the cracks of some rocks. Which of the following is most likely happening to the rocks? A. Chemical Weathering
B. Abrasion
C. Aliens from his home planet are using the rocks to communicate
D. Mechanical Weathering

the product of the pressure and volume is also constant

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

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.