part to whole relationships: tail mouse scale crocodile
A tail is a part of a mouse. A scale is a part of a crocodile. The part to whole relationship is usually used in math when talking about percentages since a percentage is a part of a whole just like a fraction. Another example of part to whole would be a slice of pizza versus the entire pizza.
item-category relationship: Monday Weekday Saturday weekend
Monday and Saturday are items. Monday fits into the Weekday category since it is a weekday. Saturday fits into the weekend category since it's on the weekend. Other item-category relationships are orange to fruit category and broccoli to vegetable category.
cause and effect relationship: cut bleed burn irritate
A cause and effect relationship is when an event happens and then the result of that event. A cut causes a person to bleed. The cut is the event or cause and bleed is the result or effect. If you burn your skin the result is that it is irritated. Another example of this would be it rains while you are outside and the effect is that you get wet.