It's the Study of Living Tissues
This page is the CodyCross answer for the clue below from Street Fair, Group 1303, Puzzle 4 (Outdoor Fun).
Question is: It's the Study of Living Tissues
and the answer is: HISTOLOGY
Word Meaning:
HISTOLOGY — (biology) The study of the microscopic structure, chemical composition and function of the tissue or tissue systems of plants and animals.
Definitions from Wiktionary.