which of these is the best explanation of how a smooth round stone become smooth - ANSWER-It was in a stream for a long time Any astronomical body that revolves around a larger body is called - ANSWER-Satellite If you place bean seeds between moist paper towels and watch the stem leaves appear you will see a demonstration of? - ANSWER-Germination Which element does not contain any neutrons? - ANSWER-Hydrogen How many atoms are in a single molecule of water (H2O) - ANSWER-2 Argon and Neon are..? - ANSWER-Noble gases Processes of the water cycle - ANSWER-Evaporation, condensation, sublimination, and so on in a balanced ecosystem, which of the following would have the greatest population? - ANSWER-Plankton water droplets - ANSWER-Condensation Friction is the force that - ANSWER-Opposes motion between 2 surfaces Which of the following reproduce by spawning? - ANSWER-Fish To test the effectiveness of plant fertilizer, groups of plants are grown with different types of fertilizer. A control group of plants would? - ANSWER-Not be given any fertilizer When scientists measure a liquids resistance to flow, they are measuring the liquids - ANSWER-Viscosity A radar is designed to report the track of an aircraft every second. If this radar reports 30 tracks in one minute, what percentage of the time did the radar track the aircraft? - ANSWER-50% Jerry walked a dog from 6:40 a.m. to 7:30 a.m. one day. If he was paid at the rate of $6 per hour, how much did he earn that day? - ANSWER-5.00