What kind of process do you use to show that a statement must be true because it cannot be false?

What benefits does this type of farming have?

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d

The declining axolotl population in mexico city is an example of in overcrowded cities. a. the surpassing of support capacity b. changes to natural environments and native species c. the lack of safe homes and tenured spaces d. the effects of a growing urban heat island