Arthropods are complex organisms. They are made up of cells, tissues, organs, and organ systems.
Complex organisms evolved from simple organisms, so simple organisms evolved first.
The common building blocks of simple and complex organisms are called cells. They are the smallest structural unit of an organism.
They're both organisms, right?
My wife is complex. And she's an animal. But I don't think I'd call her an animal to her face...
Less complicating factors than trying to study complex organisms.
Complex organisms evolved from simple organisms, so simple organisms evolved first.
arthropods
Simple Organism some simple organisms are made of single cell. Others are made of many cells that are similar Complex organisms in complex organisms, cells are organized into tissues, which make up organs. Organs form organ systems.
The common building blocks of simple and complex organisms are called cells. They are the smallest structural unit of an organism.
They're both organisms, right?
Organisms are classified as simple if they only have one cell such as bacteria, and complex organisms have multiple cells that function together to keep the organism alive and maintai homeostasis.
My wife is complex. And she's an animal. But I don't think I'd call her an animal to her face...
Less complicating factors than trying to study complex organisms.
Crabs,Spiders,and Insects
Archaebacteria are some of the oldest organisms living on Earth. They are considered simple because of their external body structure.
That depends on which organism. Generally, an organism is more complicated than an organ, but if the organism is unicellular (has one cell) then it could be more simple. Since one celled organisms don't have individual organs, then the anwer is that organisms are more complicated than organs.
the most complex group of invertebrate is cnidarians