"clunk" when a bump is hit

just started went to 3 diff gas stations.
theres a half a tank.
never had a problem before

my car is clicking when trying to start it and it won't start up.

Under the back seat where the battery is, there's water also. The battery is sitting in about an inch of water.

What is the cause of all the controls including the mirror and the radio auto shutoff to not work on the drivers door?

How do I remove the plastic cover screws