_ is a way to slow down the reactions that spoil milk

d. Keeping milk warm can help in slowing down of the reaction that can spoil milk.

Hence, d. Keeping milk warm can help in slowing down of the reaction that can spoil milk.

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b. keeping milk cold

Explanation:

The cool temperature in the fridge will stop it from going to any further reactions so it won't get spoilt

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

a electronegativity decreases beacuse the size of nucleus is bigger.