The least complex animals are often considered to be sponges, belonging to the phylum Porifera. Sponges lack true tissues and organs, instead consisting of a simple structure made up of specialized cells that perform various functions. They are primarily composed of a porous body that allows water to flow through, facilitating nutrient absorption and waste removal. This simplicity makes them some of the most primitive multicellular organisms in the animal kingdom.
The correct relationships from least complex to most complex are: atoms, molecules, organelles, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystems, biosphere.
The levels of organization from most complex to least complex are: organism, organ system, organ, tissue, and cell. Organisms are made up of organ systems, which are made up of organs, which are made up of tissues, and tissues consist of cells.
The phylum Porifera, which includes sponges, is considered to be the least complex in terms of organization and cell specialization. Sponges lack true tissues and organs, making them simple in structure compared to other animal phyla.
cells < tissue < organs <organ systems
The structures of the human body in order from least to most complex are cell, tissue, organ, and organ system.
Just switch population with ecosystem to get them most to least complex.
Plant tissue contains cell walls while animal tissue contains cell membranes. Plant tissue have chloroplast organelles that are used for photosynthesis, while animal tissue lack these photosynthetic organelles.
bones are a comlex tissue. Because your bones cannot break that easy! that is why your bones are complex
An animal's skin is keratinized epidermal tissue
The group of organ systems organized from most complex to least complex typically starts with the nervous system, then the circulatory system, followed by the respiratory, digestive, excretory, endocrine, and finally the integumentary system.
WikiSpaces Tutorbene.com ArticlesWeb.org See Related Links for links to images of plant tissue and animal tissue.
epithelial tissue, connective tissue, muscle tissue, nervous tissue