Big Bang theory<span> says that our </span>universe began<span> 13.7 billion years </span><span>ago</span>
4) Polaris
Stars emit light with energy generated by nuclear fusion, think of the Sun as an example. Polaris is a star, it's the brightest star in the little bear constellation, and therefore the correct answer.
Gold is plentiful in Africa and is a necessity for most technological devices.
Climate change is going to happen, because even without humans Earth's climate changes over time. Global warming is where green house gasses are caught in our atmosphere and the earth gradually warms up. Global warming can be stopped, or a least slowed, but climate change will happen no matter what.