Question

Scientists believe that Earth is becoming warmer. This idea will become unacceptable over time if (2 points)

it is not discussed in a scientific forum

scientific evidence supports a new idea

scientists propose an alternative hypothesis

new instruments are invented to measure temperature

Answer 1

I would say C for sure because if a new hypothesis come in to play saying that the earth is cooling then the first one is now unacceptable.

Answer 2

I'd have to say A or C.
If nobody talks about it, then how are people going to find out about it, and how will it get tested?
Or C, because there could be an alternative hypothesis that proves it wrong