You might have them work on the Venn diagram activity for this objective. Encourage students to think about why they think those differences exist. Have students work on the hollow bones demo, so they gain an understanding of the tradeoff between support and weight in the structure of bone. Students should be thinking of the implications of this finding for the Jumping Frog Problem. Students could do a lab examining the structure of bone by taking some chicken bones and soaking them for a few days in water, vinegar, bleach, etc.
Students go to muscle hut and start to study muscles.
You might have students color a coded diagram of frog muscles with the different muscle types, such as are available in the Zoology Coloring Book. Have students experiment with this by working through the Java Race. They should be reaching conclusions about which kind of skeletal muscle works best for a jump. They could complete a table comparing the different characteristics of the three types of skeletal muscle. This information is in the muscle hut.