Which two taxonomic levels are organisms
most commonly referred?

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

Which identifies the main purpose of biological taxonomy?

Which best describes this behavior? it is beneficial only to the males that do not fertilize eggs. it is beneficial only to the female workers that are not fertilized. it is beneficial to each one of the individual colony members. it is beneficial to the whole species, but not to all of the individual members.