More Formal:
* Is included.
* Is a part of.
* Comes as standard.
* Is an inherent feature.
* Is a necessary component.
* Is intrinsically linked.
More Informal:
* Comes bundled.
* Is part of the deal.
* Is a given.
* Is in the package.
* Comes along with it.
More Specific:
* Is complementary to it.
* Is a consequence of it.
* Is the result of it.
* Is the natural progression of it.
Please provide me with more context about the specific situation, and I can give you a more tailored answer.