After a start leaves the main sequence and becomes a red giant it starts to fuse different elements in its core. What is the correct change in the element from element x to element y? a) Hydrogen to Helium
b) Silicone to Iron
c) Helium to Carbon
d) Carbon to Silicon
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Which of the following is not am example of a polymer? protein nylon kevlar concreta

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?

Stephanie lives in california, and her cousin thomas lives in france. which coordinate system would be most useful if the two wanted to observe the same meteor shower and discuss their observations over online chat as they're making them? a. horizontal b. equatorial c. azimuth-altitude d. celestial or azimuth-altitude