Which is a unique feature of mercury? a. it is the smallest planet and has the shortest period of revolution around the sun. b. the thick atmosphere—made mostly of carbon dioxide—absorbs solar radiation, heating up and make the atmosphere very hot. c. the planet’s surface is covered with red, iron-oxide dust. d. it is the only planet with permanent liquid w

The ancestors of plants that lived in water had plenty of water for the young. angiosperms are a group of land plants that evolved a reproductive trait for living on land. this trait protect young plants by allowing them to grow only when water is present and the conditions for healthy development are right. what trait most likely young angiosperms in this way?