If the trend in a property is periodic, it means it will a) look terrible if the teacher wears is it
b) only be found in elements next to each other
c) only be found on one row of the periodic table
d) repeat

d) repeat

Explanation:

If the trend in a property is periodic, it means it will repeat on the periodic table.

Periodic properties on the table have a constant pattern as we move up or down a group or across a period from left to right.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

all eukaryotic cell have mitochondria : )