Different animals have different food needs. Animals use their senses to interact with their environment. Animals leave evidence of their presence. People's actions can harm or protect the environments in which animals live. When water evaporates it can not be seen, but it is still there.
Water can change states by freezing or evaporating.
Water can be compared to other liquids by observing their properties. Different objects sink or float in water. Water is used in many ways. Water can be conserved and protected or polluted and wasted. Daily weather conditions change.