Tudy the images about geologic time.

what is a noticeable difference between both eras?

the paleozoic era, not the mesozoic era, had the first dinosaurs.
the first mammals emerged in the paleozoic era, not the mesozoic era.
the mesozoic era, not the paleozoic era, had the first animals with shells.
the first flowering plants appeared in the mesozoic era, not the paleozoic era.

The first flowering plants appeared in the Mesozoic era, not the Paleozoic era

Explanation:

The Mesozoic era is well known and most famous because of the rule of the dinosaurs which were the dominant animals for most of this are. Also, it is the era in which the mammals appeared, though they lived in the shadows of the dinosaurs and only became dominant after their extinction. Another important evolution that took place and is not mentioned very often is the appearance of the first flowering plants. This was a revolutionary trait for the plants, and it helped them to survive in the changing climate on Earth. Soon this trait enabled this type of plants to spread out significantly and to become one of the most dominant organisms on the planet in the following era.

i believe the answer is a

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.