Which is the preserved evidence of the activity of an organism?

Down below

Explanation:

Fossils can give clues about the movement or behavior of once living organisms. This type of fossil is preserved evidence of the activity of an organism. For example, an organism that might walk across mud and see tracks.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.