As like the Martin Luther King comprehension activity, for the Science activities, there are 3 levels. Your child only needs to complete one. Look on the top left-hand corner of the page to see what level it is (1 star is the least challenging, 3 stars the most challenging). Please choose whichever level you think is appropriate for your child and get in touch if you're not sure what I am referring to or need help in allocating a level for your child.