The Animals Assignment

These animals have spots:
    Leapord
    Gazelle
    Baby with Smallpox

These animals have tails
    Leapord
    Gazelle
    Alligator

These aminals can kill you
     Leapord
     Aligator
     Baby with Smallpox


Questions

Does a baby have a tail?
Which spotted animals can kill?
Which non-spotted animals can kill?
Which non-spotted, non-leathal animals have tails?

The Invention Assignment

One needs iron to invent steam engines.
One needs pumps to invent coal mines.
One needs coal mines to invent rail roads.
One needs iron to invent rail roads.
One needs iron to invent guns.
One needs electricity to invent aluminum .
One needs iron to invent electricity.
One needs aluminium to invent Boeing-747s .
One needs writing to invent printing press.
One needs printing press to invent comic book.
One needs iron or aluminum to invent printing press.
One needs electricity to invent Boeing-747s.

Questions:
What do you need to invent the comic book?
What do you need to invent electricity?
If you don't have steam engines, what can you not invent?
Given aluminum and electricity, what can you invent?
Which inventions are dependant on iron?