Arduino shield compatibility

i planned make small project

like have 3 waterproof temp sensor in aquarium , can view temp online ,this idea of project

for planned

arduino uno r3 or can mega ?
arduino ethernet shield
arduino sensor shield
if possible arduino lcd display shield ( 1602 lcd board keypad shield )

can stack these on top ? project

iam not 100 percent sure think may attach of them

-----  xxxxx
-----  sensor
-----  ethernet
-----  arduino uno

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