Final answer:
To support life, a planet will need water, carbon dioxide, carbon, hydrogen, oxygen, and organic molecules, which are essential for life's biochemistry.
Step-by-step explanation:
To create a planet capable of supporting life forms similar to those on Earth, several key elements are necessary. These include water (H2O), which is vital for all known forms of life and gives Earth its distinctive blue appearance on a macroscopic level. Additionally, carbon dioxide (CO2) plays a crucial role in the carbon cycle and in regulating Earth's temperature through the greenhouse effect.
Organic molecules, particularly those that contain carbon and hydrogen, are fundamental building blocks of life, forming complex structures such as proteins, fats, and carbohydrates. The presence of oxygen (O) is critical for respiration in most Earth organisms. Lastly, glucose (C6H12O6), while not an element, represents an energy source for life through cellular respiration.