1. give an example of a sound argument that ends in the conclusion, therefore, poisonous snakes do not make good pets.
2. give an example of an invalid and therefore unsound arguement.
if you can ride a horse, then you can do just about anything.
(arguement must end in a therefore)

what is the context here? we need to know what story you're talking about : )

dr eric sanderson is a character from the book "a world without us". acording to this story dr sanderson's goal is to determine what manhattan island was in the past, before it became a city. sanderson is an ecologist who is interested in the way manhattan looked like in the 17th century.