Tropical rainforests have more kinds of plants and animals than any other land biome. which of the following is a biotic factor in a tropical rainforest? a. a stream running through the forest b. the region's air quality c. a population of decomposers d. the average amount of rainfall

Sally and sue were investigating the topic of friction in science. they used a small car and a ramp as seen in the picture to test what they were learning. they knew that they slipped easily on waxed floors but not on carpet, so they decided to change the material on the surface of the ramp to see what happened. they planned to use glass, carpet, aluminum foil, and sandpaper and run the car down the ramp over each surface. what would be the best research question to guide the girls' experiment? a) does the amount of surface area affect the friction on the moving car? b) will the car travel fastest on the glass surface? c) how does the angle of the ramp affect the speed of the car? d)do rougher surfaces tend to create more friction than smooth surfaces?

Which food could be transported in a galvanized metal container?

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?