Put the levels of organization in order from smallest to largest
community
ecosystem
organism
population

Organism , Population , Community , Ecosystem .

Explanation:

Organism is one type of species .

Population is a group of same species living together .

Community is a group of different species living together .

Ecosystem is a large group of community of species and its environment consisting of biotic and abiotic factor .

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3