The United States has already gone through two major energy transitions. It appears we are going through a third. List the three transitions and the approximate time they occurred.

(select all the correct choose each statement that is scientific. - the opinions of randomly selected participants in a survey prove the idea that global temperatures are not increasing on earth. - the universe's average temperature and rate of expansion support the idea that it began as one super-dense and hot mass 13.8 billion years ago. - ocean tides are caused by the uneven gravitational pulls of the moon and sun on different parts of earth. - human life is more valuable than other forms of life on earth because humans are more intelligent than other organisms.

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?

What is the main fuel source for the work of the cell