Which of the following is an example of a scientific question that is not testable?
why is the sky blue?
how moist should soil be for a tomato seed to sprout?
is the strength of steel related to the amount of carbon in it?
does the rate of cooling of a liquid depend upon its initial temperature?

Need the answers if its a multiple choice question

Ilike to eat pears ya nah wha im sayin b? shout out to all my pears b.

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.