When a star is in its main sequence it fuses into

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed

In the diagram, δgef and δhef are congruent. what is the value of x?

Can some one me to write a paragraph about the important natural resource to canadians, i need .