Many scientists believe that early in Earth's history, life began in water, aided by the energy from sunlight. Dissolved molecules probably bonded chemically with each other to produce increasingly complex organic molecules called "heterotroph aggregates." These molecules eventually developed the ability to reproduce.Why are heterotroph aggregates not found on Earth's Moon?
Answer(s): D
A steel ball fits exactly into a hole in a wooden block. If the steel ball is heated, which of the following will occur?
Answer(s): A
Pressure is explained as the force (a push or a pull) applied on a surface, divided by the total area over which the force is applied. For example, more pressure is exerted under Abby's heel wearing spiked heel shoes than under Abby's heel wearing flat heeled shoes.In figure A, the man is walking in snow with snowshoes and does not sink into the deep snow. In figure B, the man has no snowshoes on and immediately sinks into the deep snow.What would cause the man in figure A to sink less deeply into the snow than the man in figure B?
Answer(s): C
Air is a mixture of gases, mostly nitrogen and oxygen, but it also contains a small amount of water vapor. Depending on its temperature, water can exist in any of the three states of matter.In the diagram at the left, water droplets have formed on the outside of the can, and the can contains pieces of ice.Based on the information and diagram, which statement regarding the droplets on the outside of the can is the most accurate?
Answer(s): B
Sugar is produced in the sugar beet's leaves through photosynthesis and then is transported to the root. The root of a sugar beet weighs from 1.5 to 3 pounds.For what purpose is the root of the sugar beet adapted?
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