Why are all living organisms based on molecules that contain carbon?.

Living things are carbon-based because carbon plays such a prominent role in the chemistry of living things. This means that carbon atoms, bonded to other carbon atoms or other elements, form the fundamental components of many, if not most, of the molecules found uniquely in living things.

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

human-caused climate hope this