To address the claims and provide a balanced perspective on selective breeding, let's first consider tangerines. Tangerines, like many other fruits, did not exist in their current form 6,000+ years ago because they are hybrids of natural citrus species. Specifically, they are a result of crossbreeding between different ancestral citrus fruits. Citrus fruits, including tangerines, have a complex history of hybridization that began long after the Garden of Eden, which would have predated any such human-directed breeding. Genetic studies have shown that tangerines are hybrids involving ancestral mandarins and pomelos, and their current form is largely the result of centuries of selective breeding by humans to produce fruits that are sweeter, more flavorful, and easier to peel than their wild ancestors.
For bananas, the original bananas that existed thousands of years ago were quite different from what we see today. Wild bananas were filled with large, hard seeds and had far less flesh, making them difficult to eat. It was through selective breeding that humans created the seedless varieties we are familiar with, which have a high flesh-to-seed ratio and are much more enjoyable to eat. The differences between backyard and store-bought bananas today are largely a result of commercial pressures. Store-bought bananas, primarily the Cavendish variety, are chosen for their ability to withstand long shipping times and have a longer shelf life, whereas backyard bananas are often grown for taste. The creamy and sweet varieties you grow may be closer to how bananas tasted before commercial standardization, showing that human intervention can lead to both high-quality fruit for taste and convenient, storable versions for the market.
Your examples of different fruit varieties and even the diversity in rice are important to recognize, but many of these varieties have also been shaped by human selection over thousands of years. While Jehovah's creation provided the genetic diversity and the building blocks, humans have been able to work with that creation to bring out qualities that suit their needs, whether for taste, nutrition, or resilience to pests and diseases. Selective breeding is an example of humans exercising stewardship and care over the Earth, a role that can be seen as aligned with Jehovah's command for Adam and Eve to cultivate and take care of the garden.
The ocean, as you mentioned, is indeed largely untouched by selective breeding, and we see the beauty of Jehovah's creation in the diversity of marine life. However, this doesn’t imply that human intervention in other areas is inherently harmful. The variety and richness of the fruits you grow—bananas, jackfruit, guava, and many others—demonstrate that Jehovah’s creation offers vast potential that can be respectfully enhanced through selective breeding. The goal is not to replace nature but to work in harmony with it, bringing out the best qualities that already exist. In the case of agriculture, this has led to more nutritious, accessible, and varied food sources, which is especially beneficial for a growing human population.