4 Which of the following best summarizes the effects that plants have on the global carbon
cycle? *
(1 Point)
Plants perform cell respiration, removing carbon from the atmosphere.
Plants perform photosynthesis, adding carbon to the atmosphere.
Plants perform both photosynthesis and cell respiration and cause a net decrease of carbon in the atmosphere.
Plants perform both photosynthesis and cell respiration and cause a net increase of carbon in the atmosphere.
5
Primary producers are organisms that

Which of the following is an example of this type of co-evolution

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 characteristic make legumes a good food source for food insecure populations