why do metal's object loose their luster after a while
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Explanation:
Oxides of metals are thermodynamically more stable than the metal itself. Therefore once exposed to oxiding atmosphere they always tend to oxidize. ... Due tbe presence of thin oxide layer the metals appear to loose their luster.
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A Perfect Flower
Hibiscus flowers are perfect flowers (also known as complete flowers). This means each flower has both male and female reproductive structure, petals, sepals and a receptacle. An imperfect, or incomplete, flower is missing one or more of these features.
Petals, Sepals and Receptacle
The receptacle is the point on the stem to which the other structures attach. Sepals are small green petal-like structures that cover the petals before they emerge. Looking at a hibiscus flower from the back you will see five sepals radiating from the stem at the base of the flower. The hibiscus has five petals. The petals are unfused, meaning they are each separate from one another.
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Hibiscus flowers are perfect flowers (also known as complete flowers). This means each flower has both male and female reproductive structure, petals, sepals and a receptacle. An imperfect, or incomplete, flower is missing one or more of these features.
Petals, Sepals and Receptacle
The receptacle is the point on the stem to which the other structures attach. Sepals are small green petal-like structures that cover the petals before they emerge. Looking at a hibiscus flower from the back you will see five sepals radiating from the stem at the base of the flower. The hibiscus has five petals. The petals are unfused, meaning they are each separate from one another.
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