Please help me asap id really appreciate it

Based on what you know about the location of the earth in relation to the sun, why is this called the goldilocks zone in other galaxies?

Rainbow trout is non- native to the united states. however this species is breeding with the native gula yltrout acientistrecently observed that the hola trout were becoming exitinct what is the cause of their extinction

The blue segment below is a diameter of oo. what is the length of the radius of the circle?