sea squirt
The answer is "sea squirts".
try Sea Squirt
Parasites such as tapeworm, planarian and live fluke have digestive systems that are saclike. Their digestive tracts have one opening and they live inside a host animal.
VacuoleThe saclike storage structure found in both animal and plant cells is the vacuole. A vacuole is a membrane enclosed structure that is filled with water containing various dissolved substances.
VacuoleThe saclike storage structure found in both animal and plant cells is the vacuole. A vacuole is a membrane enclosed structure that is filled with water containing various dissolved substances.
An archipterygium is a primitive fan on an animal.
the human brainstem is the mos similar to that primitive animal
A primitive animal is a type of organism that is considered to be simple in structure and function compared to more complex organisms. These animals often exhibit features that are similar to ancestral forms, reflecting an earlier stage of evolution. Examples of primitive animals include sponges and jellyfish.
Animal-like protists
Animal like protist. Protozoa means primitive animal.
During gastrulation, two openings form in most animals. If the first opening becomes the mouth, the animal is a
Sack like organelles that store materials in a cell are called vacuoles. Vacuoles tend to be larger in plant cells then in animal cells.