which new idea has been added into our theory of solar system formation as a result of the discoveries of extrasolar planets?

Which of the following areas has the highest population density?

Impressions of tropical swamp plants were observed on rocks in polar regions. the impressions were dark black imprints, which means the fossils are examples of ( 1 ) the fossils tell us that polar regions ( 2 ) ( 1 ) a. carbonization b. mineralization c. trace fossils ( 2 ) a. had tropical plants that can grow in ice b. might have had a diffierent climate in the past c. will have abundent vegitation

Which measure of humidity, relative humidity or dew point, best describes the actual quantity of water vapor in a mass of air