What are some structural adaptations of adult frogs that help them survive in their environment? Explain how each adaptation helps the frogs.

Well I think that the frogs ability to breath underwater is a adaptation to help them from prededors. Also, they have camophlage to help too.

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.