Dead zones are low-oxygen areas that develop on the sea floor. scientists hypothesize that phytoplankton blooms cause these dead zones. phytoplankton blooms occur when excess nutrients are introduced by pollution from fertilizers, sewage plants and the burning of fossil fuels. which of the following would most likely cause an increase in these contributors to dead zones? rainfall patterns that increase freshwater runoff from terrestrial ecosystems replacing coal-fired power plants with windmills farming practices that reduce nitrate and phosphate applications constructing efficient water-recovery and treatment plants

How many cells are our body made of ? ♡

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 statement about relative potential energy of electrons is correct? a. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 2 s orbital of the second electron shell. b. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 3 p orbital of the third electron shell. c. an electron in the 3 p orbital of the third electron shell has more potential energy than an electron in the 2 p orbital of the second electron shell.