Continuation of Yesterday's Data

2 hour:
#1- 1%
Elodea is dead or closed to dying: almost completely crumpled to the bottom of the test tube

#2- 2%
Water is not quite as murky as in the first test tube but similar


7 hour:
#1- 5%?
Completely crumpled to the bottom of test tube- water isn't murky but Elodea is brown and weak

7 hr. #2- 3%



picture of 7 hour #1:

Picture of 2 hour #1: Water is murky and foggy

QUESTION OF THE DAY:

....WHY ARE THE 2 HOUR DYING AND NOT THE 7 HOUR!?