|The manual will sometimes indicate if those cards can be changed.|
Wifi cards do seem often to be replaceable - more so than graphic adapters.
This is the service manual for your model:
from which it appears that the max RAM is typically 4Gig; but with "appropriate" memory chips it could be a high as 8Gig - there appear to be two types of RAM modules possible (info at chapter 1 page 1). Oddly at chapter 1 - page 19... the RAM max seems to be 4Gig?
Wifi module is removable; as is bluetooth, and surprisingly - the cpu seems to be too (though whether or not you can find another faster etc. cpu to upgrade to?). Likewise the webcam... I don't see any references to removing a graphics adapter; which would lead one to conclude it's hardwired/integrated within the motherboard. I note the specs do show several graphic adapters - depending on which model laptop you have; but in the manual there is no reference to actual removal of such adapters... Possibly a call to Acer themselves may shed light on that aspect?
If you do decide to have a go stripping down the laptop - ensure you use screwdrivers with the correct sizes and styles head. Also I suggest you "carefully" note where each screw was prior to removal. Often screws look identical to the naked eye - but aren't in actuality. Apple use a a mix of almost identical screws to hold the base of Macbooks in place; the screws look the same - but are either different lengths, or have collars, and/or are pan or countersunk heads. I would suggest taking a piece of stiff paper or thin card and insert (or tape?) each screw into (onto) it such away as to clearly show where it came from on the laptop (perhaps with a simple map/outline of the laptop itself drawn on the card).
These youtube videos may be of interest too (although the poor audio and a high degree of wobbly-cam do make them less than easy to follow at times...)
And if one goes parts hunting... it seems to confirm the motherboards do use an integrated graphic card/adapter... An example here:
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