These are "I have, who has" cards for organelles. The top of the card has the name of an organelle. The bottom of the card has a description of a different organelle. The first student reads the bottom of their card - the description of the organelle. Then all the rest of the students look at the top of their cards for the name of the organelle that matches the description. They then say "I have _______" to make sure it is correct, and then "who has ________________" and they read their description.
There are 18 cards - I print off multiple of a few cards if I have more than 18 students in a class.