LIFE SCIENCE

Detailed explanation-1: -The organs then formed organ systems and thus complex organisms were formed. This is the hierarchy seen in the evolution of animals. Thus the correct ans is Cells→Tissues →Organs →Organ system i.e. option B.

Detailed explanation-2: -The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.

Detailed explanation-3: -Biological hierarchy refers to the systemic organisation of organisms into levels, such as the Linnaean taxonomy (a biological classification set up by Carl Linnaeus). It organises living things in descending levels of complexity: kingdom, phylum, class, order, family, genus, and species.

Detailed explanation-4: -The levels of organisation in multicellular organisms are: organelles → cells → tissues → organs → organ systems → living organism.

Detailed explanation-5: -An organism is made up of four levels of organization: cells, tissues, organs, and organ systems. These levels reduce complex anatomical structures into groups; this organization makes the components easier to understand.