At what core temperature does hydrogen begin to fuse to helium? at what core temperature does hydrogen begin to fuse to helium? 3,000 k 100 million k 1 million k 5,800 k 10 million k

The process of hydrogen fusing into helium is called nuclear fusion. With this fusion, 10 million k of temperature is required for the fusion to occur. So, the correct answer is your last option, 10 million K. 

Let me know if you need further info. :)

                  - Dotz

I’d have to say no because without oxygen in the water the fish would all be dead. so if you want to fish for dead fish, pick the ponds with the lowest oxygen concentrations.

The air is going to come out because of the low pressure.