Patrin conducts an investigation to test the hypothesis that carbon dioxide is exhaled from her lungs. She makes an indicator solution by mixing bromothymol blue into water in an erlenmeyer flask. Bromothymol blue is a chemical indicator that turns yellow in solution in the presence of an acid. Patrin knows that carbon dioxide slightly dissolves in water to form carbonic acid. Patrin exhales through a straw into the indicator solution and observes its color changing from blue to yellow, indicating that her hypothesis is correct.

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat

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?

What organs comprise the respiratory system of a bird