What is the main idea of the article, "Great Wall of China"?

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum

How do i turn 2 s into one in the products