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.
Secondary Succession is the type of ecological succession that happens to the area that has the preexisting soil and had previously inhabited before the disturbance or intervention that led to reduction and devastation of initial inhabitants and their habitat.