Why would you not test the affect on the amount of water and temperature on the germination of seeds at the same time pleeeaseee me

In this case, there are 2 variables: 1. the amount of water & 2. the temperature. Only 1 variable can be tested at a time, while the other must remain a constant. Otherwise, any changes seen in germination can't be attributed to to the amount of water or the temperature.There can only be one variable tested for and all else must remain constant.

True, for example the gulf of mexico is surrounded by the us and spain& mexico.

Cis your correct answer