Answer:
Can be a change in size and a number.
Step-by-step explanation:
Quantitative observations involve amounts which are expresed in numbers. A chage in size can be quantitative if you informe how much does the size change- for example: a change of 1 meter, from 1 meter to 2 meters. A number is generally a amount of something, so it is part of a quantitative observation. By other hand, a change of state and a color, are qualitative observations, which are made by using our senses (for example, the sight for color), but their do not involve measurements.