In cattle, the allele for solid coat color is dominant (R) and the allele for white-spotted coat is recessive (r). A rancher crossed two cows, both solid color. What combination of genes in the solid-coat parents could result in offspring with the white-spotted phenotype? Choose the correct answer.

rr and rr

Rr and Rr

RR and rr

RR and RR

What happens whenever a net force acts on an object

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?

Cells destroy body cells infected by a virus or bacteria. killer t t memory t none of the above