In BTC transaction, If there are multiple senders in a given transaction, who pays the fee?

I am familiar with EVM chains, and the transaction there are quite straight forward, you have a sender, receiver, you have a fee and other internal and token transfers.

Incase of Bitcoin (i thought it would be much simpler since we are just dealing with bitcoin and no other complexity that we can do it evm chains), there seems to be multiple sender and multiple receiver (in some cases), my questions is:

1. If there are multiple sender how is the fee split between the sender?
2. I see there is no one to one sender to receiver (in terms of value), for eg, there may be 1 sender sending 1 bitcoin and another sender sending 3 bitcoin , but the recievers might receiver this way: first one receives 2 bitcoin and second receiver receives 2 bitcoin. so in this case who sent how much bitcoin to who? in case of ethereum for eg, we clearly see which address send how much to which address, this doesnt seems to be case in terms of bitcoin.

any one can help me with this?