Life finds a way.
Why it is hard sci-fi
Crichton wrote the novel as a working argument that a privately funded recombinant-DNA park is a containment problem first. The film keeps that spine. The science is a paragraph delivered as an animated children s short, but the failure modes are exactly right. A single disgruntled engineer collapses the security envelope. Bred-only-female populations breach the constraint via amphibian DNA. The rules of the park were never the rules of the animals.
Science inside it
Recombinant DNA from amber-trapped mosquitoes, gene gap-filling with frog DNA, frozen embryo storage, electric fence containment, and chaos theory as the films explicit framing of why the park fails. Malcolms speech about strange attractors is a real pitch for nonlinear dynamics, even if the film simplifies the maths.