Light can pass through for photosynthetic organisms
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What is water used for in sweating?
Cooling
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What does water provide in the body and cells?
Support
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What does water do for inorganic ions?
Acts as a solvent; holds them in cytoplasm and body fluids
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Why does water spread across certain surfaces (e.g glass)?
Adhesive forces are stronger than the cohesive (hydrogen) forces. With some materials, water will just bead up.
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What is important about the density of water?
Water is more dense than ice (as ice has air pockets), allowing ice to float for habitats; ice acts as an insulator, allowing an aquatic habitat below; allows small (low density) organisms to be supported
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