This medium crossword about biology has 15 clues, 7 across and 8 down, on an 11 by 11 grid.
The longest answer runs seven letters: "Essential nutrient constructed from amino acid chains" (10 Across). It crosses four other answers, so getting it early opens up much of the grid.
The worksheet
The PDF has the worksheet on page one and the filled grid on the last page, so you can print the puzzle and keep the key for checking.
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