How much of the ocean is made up of salt?

3.5%

Seawater is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of approximately 3.5%, or 35 parts per thousand. This means that for every 1 litre (1000 mL) of seawater there are 35 grams of salts (mostly, but not entirely, sodium chloride) dissolved in it.

Explanation:

In percent? 3.5% of the ocean is made of salt (approx.)

Explanation:

a mother eats twice as much to support her growing fetus

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