In British English a receipt is a piece of paper that you get in a shop when you buy something, but in American English the more usual term for this is sales slip. I wrote her a receipt for the money.
Primary succession is the series of community changes which occur on an entirely new habitat which has never been colonized before. Examples of such habitats would include newly exposed or deposited surfaces, such as landslips, volcanic lava and debris, elevated sand banks and dunes, quarried rock faces.
Primary succession happens simultaneously with the growth of the pioneer species. During the primary succession, a barren land is transformed from a lifeless environment into a environment which supports life. Secondary succession is the process where one community is changed into another.