During a 30 year period a severe drought occurred in three separate years according to this information what is the yearly frequency of drought?

During a 30-year period, the yearly frequency of drought is 10%,

Explanation:

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.