Endospores are hardy, defensive structures that enable some bacteria to survive harmful environmental conditions, such as starvation, high temperatures, desiccation (drying out), chemical disinfectants and extremes in pH.
Recursive formula is a formula that is used to determine the next term of a sequence using one or more of the preceding terms.
Recursion is an important programming technique that causes a function to call itself. One example is the calculation of factorials. The factorial of 0 is defined specifically to be 1. The factorial of n, an integer greater than 0, is the product of all the integers in the range from 1 to n.