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The simplest organisms of the animal kingdom are sponges. Sponges lack true tissues and organs, instead having a simple body structure made up of specialized cells that perform different functions. They are filter feeders that live in aquatic environments.
The simplest organized substance known is probably elemental hydrogen, with each atom consisting of just one proton and one electron. Hydrogen is the lightest and most abundant element in the universe.
Bacteria are the simplest single-celled organisms that lack a distinct nucleus and membrane-bound organelles. They have a simple cellular structure composed of a cell membrane, cytoplasm, and genetic material in the form of a single circular chromosome. Bacteria are vital to various ecological processes and can be beneficial or harmful to other organisms, including humans.
Atoms
In science, tissue refers to a group of similar cells that work together to perform a specific function in an organism. These cells are specialized and organized into structures that are essential for the overall health and functioning of living organisms.
The nerve net is the simplest form of a nervous system found in multi=cellular organisms.
Bacteria and archaea are the simplest life forms that exhibit cellular structures. They are prokaryotic organisms, meaning they lack a membrane-bound nucleus and organelles found in more complex organisms like plants and animals. Their cellular structure consists of a single, simple cell that contains genetic material and basic cellular machinery.
Single-celled organisms like bacteria and archaea are considered some of the simplest organisms due to their basic structure and lack of specialized organelles. They are typically unicellular and do not contain a nucleus.
Flatworm
ESF
The simplest living organisms have one cell. These single-celled organisms are called unicellular organisms and include bacteria, archaea, and certain algae and protozoa.
prokaryotes
i blieve
They are, indeed, the most simplest multi-cellular marine animal
yes, they are
blood
The sponge.