Which statement best describes the relationship between carbon dioxide and the greenhouse effect?
A.
Carbon dioxide is the most important aspect of the greenhouse effect, as it stays in the atmosphere longest.
B.
Carbon dioxide is one of the multiple greenhouse gases that contribute to the greenhouse effect on Earth.
C.
Carbon dioxide is a necessary part of the greenhouse effect, as it’s solely responsible for keeping the Earth warm.
D.
Carbon dioxide is an insignificant part of the greenhouse effect, as there are several other greenhouse gases.

What point is the author trying to make by comparing the travel times of the first transcontinental railroad and the first transcontinental flight?

In the poem "we wear the mask," paul laurence dunbar voices his repressed anger and frustration toward american society. he repeats the title phrase three times in the poem, using the words mask and we to show that the first use of the phrase is matter-of-fact. in the second stanza, the statement is followed by a period, which shows resignation. however, at the end of the poem, dunbar almost shouts the phrase defiantly. the mask seems to become something he wears proudly. through this gradual emphasis on the phrase, dunbar could be implying that

Capulet: o brother montague! give me thy hand: this is my daughter's jointure, for no more can i demand. which theme of romeo and juliet is best supported by this excerpt? tragedy is often caused by people misunderstanding each other. tragedy causes people to blame one another and drive each other apart. tragedy is often necessary in order for people to forgive one another. tragedy can cause people who are enemies to forgive each other.