Question

7.) what do planets need most to sustain life?

Explanation:

The key requirement for a planet to sustain life is a stable source of liquid water, as it is essential for all known biological processes (like cellular function, nutrient transport, and chemical reactions for life). Additionally, a planet needs a suitable temperature range (to keep water liquid), a protective atmosphere (to regulate temperature, shield from harmful radiation, and cycle gases), and a stable energy source (like a star) to support metabolic processes. However, liquid water is the most fundamental, as life as we know it cannot exist without it.

Answer:

Planets need liquid water most to sustain life, along with a stable temperature range to keep water in liquid form, a protective atmosphere, and a reliable energy source (such as a host star). Liquid water is the core requirement, as it is essential for all known biological functions.