Given a string, an integer position, and a character, all on separate lines, find the character of the string in that position and replace it with the character read. Then, output the result.

Which two statements are true about a system? 1. a system is a group of objects analyzed as one unit. 2. energy that moves across system boundaries is conserved. 3. there’s only one way to define the boundaries of a system. 4. all systems are made by humans.

Ppcc assigned a story board on eg. ppcc. edu about a post-apocalyptic world called the books of wisdom. i was wondering if anyone had any advice on how to do well. also is there a way to change you name?

Summarize the work of famous environmental scientists of the past.