Prepare a summary to explain how much the final birds varied from the original birds after 1 million years of natural selection. How does natural selection explain the changes? Use the following terms or phrases in your explanation: natural selection, survival, genetic variation, and extinction.

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.

Abookcase has a mass of 38 kg and the coefficient of friction between it and the floor is 0.82 what is the maximum force of friction between the bookcase and the floor a 372n b 305n c 412n d 449n