That's commonly called a 'census'.
The study of the abundance of organisms in a specific area is known as population ecology. It focuses on understanding the factors that influence population size, distribution, and dynamics over time. Population ecologists study how births, deaths, immigration, and emigration affect population growth and overall abundance.
The subset of the population chosen by the investigator for a study is known as the sample. Sampling involves selecting a smaller group of individuals from a larger population to make inferences or generalizations about the broader population. The goal is for the sample to be representative of the population so that findings from the study can be applied more broadly.
Demographics
sample is the population we make our study about them.
The study of population change and distribution is demography.
This study is known as Mycology
Cross-sectional studies are also known as transversal and prevalence study. It is a form class of research methods that is all about population and the different case control studies that provide data on all the population that is under study.
Ecologist study population by mark and recaptur tagged and released.
Antarctica is the continent known for its penguin population. Researchers often travel south to study various species of penguins in their natural habitats.
Accessible population refers to the subset of a population that is easily reachable or available to researchers for a study. This group is typically more convenient or feasible to study compared to the entire population of interest.
Population dynamicstion…