To determine how Structure 2 helps sustain life, you'll want to consider the function of each option you provided:
A. Mitochondrion - This is the powerhouse of the cell, responsible for producing energy in the form of ATP through cellular respiration, a process vital for cell function and survival.
B. Nucleus - This organelle acts as the control center of the cell, housing genetic material (DNA) and regulating gene expression, which is crucial for cell function and reproduction.
C. Cell membrane - This structure controls the movement of substances in and out of the cell, maintaining homeostasis and allowing for communication and nutrient uptake, essential for survival.
D. Chloroplast - This organelle is found in plant cells and is responsible for photosynthesis, converting light energy into chemical energy (glucose), which is vital for life on Earth.
Each option describes an important cellular structure that contributes to life in different ways. The best answer depends on the context of your question regarding how structure 2 specifically contributes to sustaining life. If you can clarify what "structure 2" refers to in your context, I can help you better. Otherwise, all these structures play critical roles in sustaining life.