It is the Epithelium and blood-forming tissue. Endothelial cells are epithelial cells that shape a thin layer of straightforward squamous epithelium known as the endothelium. Vein endothelium is nonstop with the inward tissue coating of organs, for example, the mind, lungs, skin, and heart. Endothelial cells are gotten from endothelial undifferentiated organisms situated in bone marrow.
I think its false because gas exchange can happen in blood also
Answer:
Explanation:
Anatomy. Species may share similar physical features because the feature was present in a common ancestor (homologous structures).
Molecular biology. DNA and the genetic code reflect the shared ancestry of life.
Biogeography.
Fossils
