LIFE SCIENCE

Detailed explanation-1: -All the cellular organelles are made of macromolecules like carbohydrates, Lipids, Proteins, and Nucleic acids (DNA, RNA). Atoms-To make macromolecules involves even smaller building blocks.

Detailed explanation-2: -The levels, from smallest to largest, are: molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere. The organism level is the highest level of organization.

Detailed explanation-3: -The structural sequence of an organism from largest to smallest is as follows: organism → organ system → organ → tissue → cell → organelle → macromolecule → molecule → atom.

Detailed explanation-4: -The major levels of organization in the body, from the simplest to the most complex are: atoms, molecules, organelles, cells, tissues, organs, organ systems, and the human organism. See below Figure 1.1.