What structures join with the cell's membrane during exocytosis

You may expect bonds between two atoms which each have n covalent lonic metallic hydrogen

Scientists often deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each of these numbers in an alternate form.

How many moles are in 7.2 x 10^23 carbon molecules?