*Question*
Phase changes do not change mass, and melting is a phase change. Given these facts, what does melting not change? among the following options: - energy - vapors - fats - mass - liquid - ligt - heat - copper
**Answer**
mass

*Question*
Running water is better able to dissolve oxygen and nutrients than standing water, and water is made up of H2O molecules. Given these facts, what dissolves oxygen better when running than standing among the following options: - H2O - NaCl - pH - CO2 - CO 2 - O2 - O3 - H20
**Answer**
H2O

*Question*
Adrought can change the color of an environment from green to brown, and drought, or a lack of water, is often a problem for farmers and communities around the world. Given these facts, what can change the color of an environment from green to brown among the following options: - lack of water - clouds - trees - increased h2o - climate - deforestation - burning - Greenhouse gases
**Answer**
lack of water

*Question*
Secondary growth forms secondary vascular tissues and bark, and all trees have bark. Given these facts, what has secondary growth among the following options: - viscosity - plants - oak - density - ferns - primary - trees - leaves
**Answer**
trees