Living cells use as their main source of energy. a)carbohydratesb)cellulosec)lipidsd )proteins

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

Directions: read the descriptions of the four islands presented in the lesson. 1. list two new traits that each new species of rat might demonstrate as it adapts to the conditions on each island. 2. introduce one of the four new rat species to another island and describe one challenge it would encounter and one success as it adapts to its new environment.

Apuppy’s tendency to chew is inherited through which of the following? a. through learned behavior b.through genes c. through seasonal cycles d. through hibernation