The nonfunctional pelvis and hind limbs found in some snakes support which statement about evolution?

a) snakes began to evolve these structures, but selection pressures did not favor them.

b) mutations tend to make species evolve to resemble other species in their environment.

c) snakes evolved from the same common ancestor as species in which these structures are functional.

d) selection pressures promoting snake evolution ceased before snake anatomy was well adapted.

Many organs are involved in the processes of keeping the blood and the body clean. when poisonous or harmful substances are in the blood, they are absorbed by the and released in a less harmful form. when wastes are present in the blood, they are filtered out and removed from the body by the

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?

During convection, less dense fluid rises and denser fluid sinks.