Wildfires in Crater Lake burned approximately 33,000 acres in 2011, leaving 25 square miles of charred timber and bare ground. The five-week fire burned the loblolly pine trees and seeds for which Bastrop
State Park is famous. Park rangers are hoping that new plant growth on the bare soil cover will
eventually be established as pine trees; however, immediately following a wildfire, the first plants which
emerge will most likely be grasses as a stage in-
a primary succession
b. secondary succession
c. tertiary succession
dclimax community

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.

her next move would be to use agarose gel electrophoresis to separate the dna molecules of varying length and create a dna fingerprint.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added