Final answer:
The SI unit for length is the meter, for mass is the kilogram, and for time is the second.
Step-by-step explanation:
The SI unit for length is the meter. It is used to measure the distance or size of an object. For example, you can use a meter to measure the length of a street.
The SI unit for mass is the kilogram. It is used to measure the weight or mass of an object. For example, you can use a kilogram to measure the size of a small worm.
The SI unit for time is the second. It is used to measure the duration or interval of an event. For example, you can use a second to measure the distance from one town to the next.