Which state of matter is the least dense? liquid all the above solid gas

Need with these questions . need the answers in a rush for these questions are the answers i put down are correct or not? ?

Introducing minvasive species to an ecosystem results in an increase in biodiversity is it true or false

The us council on environmental quality, the world wildlife fund of the united states, the ecological society of america, the smithsonian institution, and the international union for the conservation of nature have proposed four principles of wildlife conservation. which of the following does not apply to wildlife conservation? a) continuous monitoring, analysis, and assessment b) ecosystem maintenance that includes wildlife c) a plan encompassing entire communities of organisms and all renewable resources d) a continued interest in harvesting populations for sport