Biosystematics aims at

The correct option is: "the classification of organisms based on their evolutionary history and establishing their phylogeny on the totality of various parameters from all fields of studies"

Detailed Explanation:

Biosystematics is a modern branch of biology that goes beyond traditional taxonomy. While classical taxonomy primarily focuses on identifying, naming, and classifying organisms based on observable morphological characteristics, biosystematics aims to understand the evolutionary relationships and genetic variations among different groups of organisms.

To achieve this, biosystematics utilizes a comprehensive approach. It does not rely on a single set of characters. Instead, it gathers data and parameters from all available fields of study, including:
- Morphology and Anatomy: Structural features and internal organization.
- Cytology and Genetics: Chromosome number, structure, behavior, and genetic makeup.
- Phytochemistry/Biochemistry: Chemical constituents, proteins, and DNA sequences (molecular systematics).
- Ecology and Physiology: Adaptation to environments and functional processes.
- Embryology and Palynology: Developmental stages and pollen structure.

By analyzing the totality of these diverse parameters, scientists can reconstruct the evolutionary history (phylogeny) of organisms. This allows for a natural classification system that accurately reflects how different species evolved from common ancestors, rather than grouping them simply by superficial similarities.