Food tech

Question- How does milk become youghurt

Hypothesis-I think put cream and sugar inside the milk and freeze it.

Material-Milk
               yoghurt

method- In a beaker add 150mls of trim milk and two teaspoons of Acidophilus yoghurt. stir to mix. leave out overnight repeat with cream and with blue(full milk)

Observations:Trim,Blue,Cream

Predictions:the cream was thick and looked like yellowish. and the trim milk looks like greenish and the blue milk looks like the original milk. This is what it looks like after freezing it

The cream smells like cheese.

Bacteria reproduced

bacteria fed off the sugar

Trim milk made a thinner yoghurt than blue milk or cream because it has less sugar.

My hypothesis is wrong because we had to put milk and cream together and put in a beaker and after 5 days in the fridge and 2 days out it turned like this.