I think you wrote this wrong? Is it not round rr vs wrinkled RR?? I'll answer it with that assumption:
You are crossing a rr with an RR:
You only get Rr back so they will phenotypically be all wrinkled
If you are crossing rr with an Rr (so a heterozygote wrinkled):
50% will be Rr (wrinkled)
50% will be rr (round)
See my picture for the Punnett Squares for both answers!
1) Technique B
2) Because it preserves the harmless insects and targets only moth larvae
Hope this helps :)
Flora are plant life and fauna are animals
Well, when there is earthquakes, the earthquakes move around most of the fossils into other places and other continents and rivers and oceans, so earthquakes move all the fossils.