6 copies of Fight the Invaders! You will encounter many creatures that appear harmless, but don't be fooled. They are harmful invaders - organisms that go where they don't belong.
The Teacher's Guide is your complete resource for instruction and planning.
Single copy of Fight the Invaders! You will encounter many creatures that appear harmless, but don't be fooled. They are harmful invaders - organisms that go where they don't belong.
6 copies of the Spanish edition of Fight the Invaders! You will encounter many creatures that appear harmless, but don't be fooled. They are harmful invaders - organisms that go where they don't belong.