Just as organs are separate body parts that perform certain functions in the human body, organelles are microscopic sub-units that perform specific functions within individual cells. Single-cell organisms are usually prokaryotic, while multi-cell organisms are usually made of eukaryotic cells.

An organelle is a tiny cellular structure that performs specific functions within a cell. Organelles are embedded within the cytoplasm of eukaryotic and prokaryotic cells. In the more complex eukaryotic cells, organelles are often enclosed by their own membrane.

An organelle (think of it as a cell’s internal organ) is a membrane bound structure found within a cell. Just like cells have membranes to hold everything in, these mini-organs are also bound in a double layer of phospholipids to insulate their little compartments within the larger cells.

A single cell is often a complete organism in itself, such as a bacterium or yeast. Other cells acquire specialized functions as they mature. These cells cooperate with other specialized cells and become the building blocks of large multicellular organisms, such as humans and other animals.

A multicellular organism develops from a single cell (the zygote) into a collection of many different cell types, organized into tissues and organs. During development, cells use both intrinsic, or inherited, information and extrinsic signals from neighbors to “decide on” their behavior and identity.

Answer. Explanation: Yes, A single cell live independently on its own. Amoeba is a single celled organism That can perform everything a living organism needs to.It can take its own food, respire,reproduce etc.

The first evidence of multicellularity is from cyanobacteria-like organisms that lived 3–3.5 billion years ago.

This is as true for the simplest of multicellular animals, the sponges, as it is for the most complex.

Macroscopic multicellular life had been dated to around 600 million years ago, but new fossils suggest that centimetres-long multicellular organisms existed as early as 1.56 billion years ago.

The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old. Stromatolites are created as sticky mats of microbes trap and bind sediments into layers.

Multicellular organisms are composed of more than one cell, with groups of cells differentiating to take on specialized functions. In humans, cells differentiate early in development to become nerve cells, skin cells, muscle cells, blood cells, and other types of cells.

In single-celled organisms such as protists , and small multicellular organisms, essential molecules will move to where they’re needed by diffusion . Once an organism is beyond a certain size, it cannot get essential molecules into and out of cells solely by diffusion.

Humans—and other complex multicellular organisms—have systems of organs that work together, carrying out processes that keep us alive. The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems.

It is a living organism (contains DNA or some analogue, and reproduces). Nanobes are about 20 nm in diameter, which may be too small to contain the basic elements for an organism to exist (DNA, ribosomes, etc.), suggesting that if they grow and reproduce they would need to do so in an unconventional way.

The main purpose of a virus is to deliver its genome into the host cell to allow its expression (transcription and translation) by the host cell. A fully assembled infectious virus is called a virion.