Question

match the vocabulary word with the correct definition.
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large, naturally occurring ecological levels occupying a major habitat; include aquatic, forest, grassland and wetland
unit expressing a ratio of a solute in a solution
any living organism
smaller community where biotic and abiotic elements interact within a biome
:: biotic :: parts per thousand (ppt) :: ecosystem :: biomes

Explanation:

• Biomes: They are large, naturally - occurring ecological levels occupying a major habitat. Examples include aquatic, forest, grassland, and wetland. This matches the first description.
• Parts Per Thousand (ppt): It is a unit that expresses a ratio of a solute in a solution. So, it fits the second description.
• Biotic: By definition, it refers to any living organism. This is in line with the third description.
• Ecosystem: An ecosystem is a smaller community where biotic and abiotic elements interact within a biome. Thus, it matches the fourth description.

Answer:

1. Biomes: large, naturally occurring ecological levels occupying a major habitat; include aquatic, forest, grassland and wetland
2. Parts Per Thousand (ppt): unit expressing a ratio of a solute in a solution
3. Biotic: any living organism
4. Ecosystem: smaller community where biotic and abiotic elements interact within a biome