Question

1. water is unusual because it is less dense as a solid than a liquid. this is important for marine organisms because: cold water holds less oxygen than warm water. a layer of ice insulates organisms beneath it; if ice was denser, the oceans would freeze from the bottom and remain frozen, leaving no available space. all answers are correct. a layer of ice insulates organisms beneath it. it influences the solubility of carbon dioxide.

Explanation:

• Cold water actually holds more oxygen than warm water, so the first option is incorrect.
• The solubility of carbon dioxide is not directly related to water being less dense as a solid than a liquid in the context of marine organisms' survival in this question.
• The key point is that a layer of ice (which floats because it's less dense) insulates organisms beneath it. If ice was denser (sank), oceans would freeze from the bottom and remain frozen, leaving no available space for marine life.

Answer:

a layer of ice insulates organisms beneath it; if ice was denser, the oceans would freeze from the bottom and remain frozen, leaving no available space.