Who amongst the following was the first to state that the Earth was spherical?

Who among the following was the first to explain that the rotation of the earth on its own axis accounts for the daily rising and setting of the Sun?

Which one of the following Stars is nearest to the Earth?

Which of the following planet is nearest to earth?

Which of the following Method is used to determine the age of the Earth –

Which of the following ecosystem covers the maximum area on earth?