Answer:
A
Explanation:
well i guess it also depends on what environment you are talking about too
<span>The more similar the embryonic development of two species, the more closely they are related.</span>
According to a source the answer is <span><u>Cyanobacteria were the first organisms to produce oxygen in water, which then escaped into the atmosphere.</u>
These cyanobacteria species were the first ones to "produce" oxygen as a by-product of the photosynthetic mechanisms which enables organisms to make their own food. </span>
This is copied what google:
“Paleoanthropology, also spelled Palaeoanthropology, also called Human Paleontology, interdisciplinary branch of anthropology concerned with the origins and development of early humans.”
I think it’s basically: a branch of anthropology, the study of the development and origins of early human beings.
Explanation:
Pulmonary Arteries where the blood is re-oxygenated.