What scientific field was created when recombinant dna was first made in the 1970s

The correct answer will be- Genetic engineering.

Explanation:

The genetic engineering is the branch of the molecular biology which deals with the transfer of the genetic material from one organism to another organism. This technology of propagation and inserting genes into another organism was invented by the Stanley Cohen and Herbert Boyer in 1973.

The recombinant DNA technology leads to the production of the genetically modified organism by inserting the gene of interest in the organism and thus, the branch of the study is known as genetic engineering.

Thus, genetic engineering is the correct answer.

i think the answer is gold im not entirely sure

"a.) well–developed vascular system."