Its placed randomly in a number of sites in the habitat being studied.
They are the same size so you will know that it is always right. The disadvantage is you will have to depend on human accuracy in the project.
A quadrat is a square or rectangular sampling frame used in ecological research to study and measure the distribution of organisms in a particular area. It helps researchers collect data on population density, species diversity, and habitat characteristics in a standardized and systematic way. By placing quadrats at random or predetermined locations within a study area, scientists can gather quantitative data to analyze and compare different ecological communities.
Kilogram per cubic meter is the one that doesn't belong. Square meter is meter^2 and cubic meter is meter^3 but kilogram per cubic meter is a density
That doesn't make sense. Square meter is 2D. Cubic meter is 3D. To attempt to answer your question... A square meter is one meter long and one meter wide. A cubic meter is one meter long, one meter wide, and one meter tall.