It will be dangerous of there isn't enough oxygen to breathe

1.it will be dangerous of there isn't enough oxygen to breathe (unless)
=>
2.venus has the some gravity as Earth(to)
=>venus's gravity
3.the iPhone 16 has a great camera, and the speaker is really good ( also)
=>the iphone16
4.the new phone has a great screen,but the battery is terrible (however)
=>the new phone
5.the temperature in mars is too cold for human to live in (enough)
=>the temperature