An unprocessed pre-mrna has the following structure.
which of the following is not a possible size (in bp) of the mature mrna?
205bp
180bp
150bp
100bp

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

a chair, a bed, and a toothbrush

explanation:

i was told this before by a teacher, so yeah

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.