Which variable would be the independent variable ?

Use the drop-down menus to label each of the following changes p for physical change and c for chemical change.

Where is energy trapped inside the organelle chlorophyll

Living cells cannot use heat to provide the activation energy for biochemical reactions because which choice(s) complete the sentence correctly? a) answer choice ii. eliminate b) answer choices ii and iv. c) answer choice iii and iv. d) all answers can complete the sentence.