Water will be a product in a dehydration reaction. For example, when copper sulfate hydrate is heated, the water of crystallization vaporizes, leaving behind copper sulfate anhydrate.
If the choice is true or false, the answer is true. Most of hominins were probably nearly as efficient at bipedal locomotion as humans. However, the bones of their pelvis were shorter from top to bottom than humans. This made their pelvis more stable for weight which supports standing upright or moving bipedially.
If organisms that lived there before had exceeded the carrying capacity then the ecosystem would no longer be able to sustain life