What steps are involved in gene therapy?

Me with these questions if you’re it sure don’t answer

During the process of two rails or sides break apart and attract new nucleotide bases to form a new and complete strand.

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.