Answer:
How does an organisms DNA determine it's chances of survival:
Organisms with heritable (genetically determined) features that help them survive and reproduce in a particular environment tend to leave more offspring than their peers. If this continues over generations, the heritable features that aid survival and reproduction will become more and more common in the population
How does humans manipulate DNA of organisms to be benefit themselves:
Biotechnology is the use of biological techniques and engineered organisms to make products or plants and animals that have desired traits.
