Movement Not

What part of a cell controls water movement into and out of the cell?

If you know the answer, I would truly appreciate it if you answered my question. I am not sure if it is the cell membrane or not.
Furthermore, I am doing an experiment that demonstrates osmosis. We are using an egg to represent the cell. What part of the egg controls water movement into and out of the egg?
Thank you very much!
Thank you all so much!

it is in fact the cell membrane

AIRPLANE CLOCK MASTERCRAFTERS w SESSIONS MOVEMENT BAKELITE NOT WORKING+++
AIRPLANE CLOCK MASTERCRAFTERS w SESSIONS MOVEMENT BAKELITE NOT WORKING+++
$19.99
Time Remaining: 3d 8h 40m
Buy It Now for only: $79.99

REBUILT REGULA 25 CUCKOO CLOCK MOVEMENT not parts musical cookoo repair service
REBUILT REGULA 25 CUCKOO CLOCK MOVEMENT not parts musical cookoo repair service
$139.99
Time Remaining: 5d 16h 29m
Buy It Now for only: $139.99

REBUILT HUBERT HERR 1 DAY CUCKOO CLOCK MOVEMENT not parts repair cookoo coo coo
REBUILT HUBERT HERR 1 DAY CUCKOO CLOCK MOVEMENT not parts repair cookoo coo coo
$139.99
Time Remaining: 12d 16h 37m
Buy It Now for only: $139.99

REBUILT HUBERT HERR 1 DAY CUCKOO CLOCK MOVEMENT not parts coo coo cookoo repair
REBUILT HUBERT HERR 1 DAY CUCKOO CLOCK MOVEMENT not parts coo coo cookoo repair
$139.99
Time Remaining: 14d 19h 17m
Buy It Now for only: $139.99

REBUILT REGULA 34 CUCKOO CLOCK 285cm MOVEMENT not parts coo coo repair service
REBUILT REGULA 34 CUCKOO CLOCK 285cm MOVEMENT not parts coo coo repair service
$149.99
Time Remaining: 16d 16h 38m
Buy It Now for only: $149.99

REBUILT REGULA 34 CUCKOO CLOCK 195cm MOVEMENT not parts repair service
REBUILT REGULA 34 CUCKOO CLOCK 195cm MOVEMENT not parts repair service
$129.99
Time Remaining: 16d 19h 27m
Buy It Now for only: $129.99

Hermle Movement 151 040 45CM NEW not rebuilt
Hermle Movement 151 040 45CM NEW not rebuilt
$79.00
Time Remaining: 17d 4h 12m
Buy It Now for only: $79.00

Hermle Movement 151 040 45CM new not rebulit
Hermle Movement 151 040 45CM new not rebulit
$79.00
Time Remaining: 19d 16h 40m
Buy It Now for only: $79.00

4U2FIX Vintage Korean 31 Day Clock Movement Complete Not Running For Parts
4U2FIX Vintage Korean 31 Day Clock Movement Complete Not Running For Parts
$22.50
Time Remaining: 25d 13h 7m
Buy It Now for only: $22.50

4U2FIX Vintage Korean 31 Day Clock Movement Not Running For Parts
4U2FIX Vintage Korean 31 Day Clock Movement Not Running For Parts
$15.50
Time Remaining: 25d 13h 21m
Buy It Now for only: $15.50