Yes they can, but I think the point is they were unaware they could or how, try the msinfo route, it has good info about the processor, and if you click through the components, what the individual discrete components are.
If don't see a graphics card, it is likely you computer does not have a separate card, but uses the graphics integrated into the processor. Intel do chips with inbuilt graphics and without, even when it has it inbuilt (which is most common for consumer chips) you can still have a separate card as well.
A quick right click on the windows icon and select settings wil tell you about the processor and memory. There is other mother detailed info ifo scroll down that info on the right and choose System Settings.
As I say, lots of info. Don't worry if you are unsure, give it a go and come back here for more advice.