Organism.
cells < tissue < organs <organ systems
The sponge.
Animal bodies are typically organized into systems, such as the respiratory, circulatory, nervous, and digestive systems, which work together to maintain the body's functions. These systems are made up of organs, tissues, and cells that carry out specific tasks to keep the animal alive and functioning. Overall, the organization of animal bodies is complex and efficient, allowing for survival and adaptation to various environments.
A common animal is organized into specialized systems such as nervous, digestive, and reproductive systems to perform various functions. They grow by increasing cell number or size. They respond to stimuli in their environment through behaviors or physiological changes. They reproduce by producing offspring either sexually or asexually.
Fish are considered multicellular organisms. They are complex organisms made up of multiple cells with different functions, organized into tissues and organs.
nucleus
like a human
The simplest form of animal life is found in single-celled organisms, such as protists or bacteria. These organisms have basic structures and functions, without specialized tissues or organs. They rely on diffusion for nutrient exchange and do not exhibit complex behaviors like more advanced animals.
why are the number of plant systems smaller than animal systems.
They are, indeed, the most simplest multi-cellular marine animal
complex animals have no back bones and simple animals have backbones
First, animals are made of cells, those cells make up tissue, those tissues make up organs, which make up organ systems. Finally, the organ systems make up the animal.