Solve these clues to fill the grid.
- The immature free-living form of most invertebrates and amphibians and fish which at hatching
- 1 Across
- An organism that makes its own food, usually using sunlight.
- 8 Across
- To arrange or order by ___ or categories
- 9 Across
- The natural world around us
- 11 Across
- Waste matter that contaminates the water or air or soil
- 12 Across
- To consider in detail and subject to an ___ in order to discover essential features or meaning
- 13 Across
- An organism that obtains energy by eating other organisms.
- 14 Across
- To make fit for, or change to suit a new purpose
- 15 Across
- The metabolic processes whereby certain organisms obtain energy from organic molecules
- 2 Down
- Any of various water-soluble compounds having a sour taste and capable of turning litmus red
- 3 Down
- The temporal end
- 4 Down
- An animal organism in the early stages of growth and differentiation that in higher forms merge
- 5 Down
- English painter and art critic
- 6 Down
- Embryonic leaf in seed-bearing plants
- 7 Down
- To exercise authoritative ___ or power over
- 9 Down
- A number representing a quantity assumed to have a fixed value in a specified mathematical context
- 10 Down