Aparty boat resting in the middle of a small pond is holding you and 25 of your friends. the hull is broken and water begins pouring in, prompting you and your friends to evacuate onto a life raft. an empty life raft of cross-sectional area 2.0 m x 3.0 m has its top edge 0.36 m above the waterline. a. can the raft hold you and all of your 75-kg passengers before water starts to flow over its edges? b. it is discovered that one of the passengers brought their pet boulder aboard the life raft with them. explain what would happen (if anything) to the pond's water level if the rock were thrown overboard and into the pond.

The desert and tundra biomes have very different temperatures as well as extremely different plants and animals. The desert can get very hot during the day, but cool off quickly at night. It has sandy soil and supports very little plant life. Animals found in the desert include lizards, javelinas, Gila monsters, coyotes, bobcats, scorpions, and kangaroo rats. The tundra is cold, dry, and often dark. The average temperature is about 10°F. The soil below the surface is permanently frozen, and is called permafrost. A few types of plants grow during the short summer season. Animals found in the tundra include caribou, foxes, wolves, and Arctic hares.