Before the Ice age, about 50 million years ago, temperatures were much higher than they are today, the whole globe enjoyed a tropical climate. At that time forests of large deciduous (e. g. the needle-leaved dawn redwood or the broad-leaved ginkgo) grow near the North Pole. Why did they shed their leaves in the winter

Which type of bond forms between water moleculesstrong bondhydrogen bondcovalent bondpolar bond

What is the next step in muscle contraction after the actin changes shape? (apex)

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?