What is the difference in concentration of hydronium ions in a solution of pH 2.0 compared with one of pH 7.0?

she forgot to record a transaction

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

i think that it is plants

so whats the answer