Natural ones are called orifices. Artificial ones are called stomas.
Openings that lead to the outside are all lined with a mucosa.
stream lined body of a fish helps to reduced friction
serous membrane
maybe trachea??
Animals that have three layers of embryonic tissue with organs in a cavity completely lined with the mesoderm are called triploblastic animals.
Yes. A coelem is a fluid-filled body cavity completely lined by a layer of mesoderm cells.
Reptiles have 2 body openings. Mouth and an anus.
maize
2
34759234875-134957
4
7
1
Sharks have a streamlined body
The famous animal the "Porifera", has 6 body openings.
stream lined body of a fish helps to reduced friction
By them entering through openings in the body.
12