We must acknowledge that life possesses specific characteristics to answer such a question, including organization, energy, homeostasis, reproduction and development, and evolution. We must recognize evolution as fact because antibiotics, driving evolutionary change in bacteria, cannot be disputed, even with the most extraordinary intelligence.
So, the characteristic of organization can be seen in a cell.
The nucleus harbors the cell's DNA.
Ribosomes, connected to the rough endoplasmic reticulum, assemble proteins, and the smooth endoplasmic reticulum synthesizes lipids. The Golgi apparatus packets materials to be secreted from the cell. Peroxisomes dispose of toxins and break down fatty acids. Mitochondria disentangle energy from food, and the cytoskeleton assists the cell in movement and supports its structure. Despite these numerous resemblances, a few organelles vary between animal and plant cells. A lysosome is a digestive hub in an animal cell, where waste and worn-out organelles are disassembled and recycled. Plant cells seldom contain lysosomes. Digestion occurs in the central vacuole of plant cells.
Nevertheless, regulating turgor pressure is a more critical function of the central vacuole, altering size as the cell absorbs or loses water. Many plant cells correspondingly possess chloroplasts. These organelles, "little organs," use light energy to produce sugars.
The primary internal organelles of a eukaryotic cell are Nucleus, Smooth and rough endoplasmic reticulum, Golgi apparatus, Mitochondria, Peroxisome, and Cytoskeleton. A lysosome is an organelle unique to an animal cell, and a central vacuole and chloroplast are unique to plant cells. Plant cells contain a cell wall that protects them and determine their shape. Animal cells lack a cell wall.
So, when cross-sections of animal and plant cell membranes are compared. Both structures are comprised of a phospholipid bilayer with protein channels crossing them, sugar molecules connect to the protein channels in the animal cell, and it even contains cholesterol found between the lipid molecules. These two structures are lacking in the plant cell. The plant cell membrane has a cell wall surrounding it, lacking in the animal cell. This wall completely encompasses the plant cell membrane and supports the cell. Even within one organism, cells can look surprisingly different. Although four might look quite different, all are eukaryotic animal cells, so they have many of the same basic features. Furthermore, all eukaryotic cells share features with their prokaryotic relatives. These similarities in cell structure are convincing evidence for the unity of life.
So, imagine a phylogenetic tree of life, with the common ancestor between all three domains. The Domain Eukarya has branches for protists, plants, fungi, and animals. The animal and fungi branches are closer and more recent in their evolutionary histories than the plants or protists. Additionally, the branch for the Domain Eukarya emerges from the branch for the Domain Archaea, suggesting a close evolutionary relationship.
And yet, the scale of biological molecules and structures show Cells can vary between one micrometer (μm) and hundreds of micrometers in diameter. A DNA double helix is approximately ten nanometers (nm) wide within a cell, whereas the cellular organelle called a nucleus encloses this DNA can be approximately 1000 times more extensive (about ten μm).
Nevertheless, life must possess specific characteristics to be considered life.
Hernández, Timothy Alexander, Brights, Sunday, January 9,2022, Strings, street.