I’m confused and I don’t understand this can someone help?

50%

Explanation:

This is a simple one trait Punnett square.

Because we know that the recessive trait is blue (yy) thanks to the text mentioning SpongeSusie being blue and recessive. Spongebob is yellow with a genotype of Yy or heterozygous. So we need two y to make a blue baby.

Yy X yy = 50% yellow Yy and 50% blue yy

i don't know people like to fight everywhere rip.

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.