To test how fertilizer affects aquatic animals, a student prepared four identical containers with water fleas. the student then added different amounts of fertilizer mixed with distilled water to three of the containers and distilled water alone to one of the containers. what is the experimental group in this experiment? a. all the water fleas in the container with the most fertilizer b. the water fleas in the container with only distilled water c. the water fleas in all the containers receiving fertilizer d. all the water fleas in all the containers

The use of dna as evidence in criminal investigations became possible because of the

Match each description to the appropriate biome. tropical savanna desert tropical rain forest taiga tundra has sparse vegetation and very cold temperatures located near the equator and contains trees that form dense canopy layers is very hot and dry, and has plants that need little water has cold winters, heavy snowfall and is dominated by conifers has warm temperatures and is dominated by grasses

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?