1 2
3
4
5
)
3. Which of the following describes the connection between
gravity and finding extrasolar planets?
O A The gravity of extrasolar planets pull on the star they
orbit, causing a visible “wobble."
OB The gravity of the star that extrasolar planets orbit
causes the extrasolar planets to visibly “wobble."
O C The mutual gravity of an extrasolar planet and the star
that it orbits causes an irregular orbit.
D The gravity of extrasolar planets is stronger than the
gravity of planets that orbit our Sun, causing faster orbits.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

the last one: artificial selection/genetic engineering

plant breeding is modifying the genetic composition of the plant - but this isn't cloning (which is specifically introducing a gene into a genome). but you are artificially selecting for the phenotype that you want.

the second one is literally genetic engineering - the gene would have been cloned first and then inserted or genetically engineered into the new plant cell (the cotton).