Which is the most relevant source for students researching the effects of climate change?

Idon understand these and need some ! ?

Is a string of code written to hurt others by damaging or destroying

Need asap write a short paper describing the history and differences between six sigma, waterfall, agile, and scrum models. understanding these models can give you a good idea of how diverse and interesting it development projects can be. describe what the rationale for them is and describe their key features. describe the history behind their development. at least 400 words