Genetically modified organisms, or GMOs, refer to any plant or animal that has been genetically modified by humans. For centuries, breeders have been able to do this through selective breeding practices.
It’s a great guess, but an octopus is not a mammal. An octopus is an invertebrate animal, which means it has no spine. More specifically, an octopus is a cephalopod, like squid and cuttlefish. They’re some of the smartest invertebrates.
When it comes to dinosaur extinction, the working idea is what’s called the bolide impact. This is the hypothesis that a meteorite came to the surface of the Earth, hit the Earth, and led to the extinction of the dinosaurs.
Water to land evolution is a complex question, and one that is still actively researched today.
Not all plants produce nectar, only plants that are visited by animal-type pollinators. Plants that are wind pollinated, for example, will not produce nectar.