In which of the following species is the biomass of an individual the smallest?

Spirogvra sp has the smallest biomass of the four species listed. This is because Spirogvra sp is a type of spider, and spiders are generally small in size and have a low biomass compared to other animals. Tilapia sp, Agama sp, and Bufo sp are all larger animals with higher biomass than Spirogvra sp. Biomass refers to the total mass of living matter within a given area or ecosystem. In other words, it's the weight of all living organisms in a particular area. The biomass of an individual organism is the amount of living matter that makes up that particular organism. Smaller organisms, like Spirogvra sp, typically have less biomass than larger organisms because they are physically smaller and weigh less.