Which part of the body has thin walls that allow oxygen to pass through

Capillaries

Capillaries are the shortest, narrowest, and thinnest blood vessels.

Explanation:

good luck

they each offer a fresh glut of resources to the organisms that can arrive and exploit them. as individuals and new species continue to appear, they actively and passively alter the environment. competition for shared resources increases, local abiotic and biotic conditions shift, and the relative abundances of species change accordingly. the process is called ecological succession, and it is one of the earliest and most well-known concepts in ecology.

not sure if this is what you'r looking for eubacteria and archaebacteria