Why can scientist be sure about the sizes of many types of dinosaurs but not sure about how they moved or defended themselvs?

Answer 1

In some rare cases the skin or an impression of it is preserved in a fossil. Originally scientists mostly just assumed they had scales. Recently the impressions indicate that some species such as raptors (even the T-Rex) had feathers, probably for mating displays. Others, such as triceratops had bristles indicating that hairy dinosaurs were a possible classification. Both the feathers and hair may have been used for insulation and temperature control.

Answer 2

well they cannot account for parts like skin, which rotted, but bones give a shape. they could be pink 4 all we no.

Answer 3

It's much harder to determine behavior from fossils than physical characteristics.

Answer 4

Because they're old...wlawl