<span>The following statements explain how oxygen was introduced into the earliest atmosphere of the Earth and how the presence of oxygen affected life on Earth. </span><span> B) Oxygen is needed to carry out many life processes. The addition of oxygen to the earth's atmosphere assisted with the development of eukaryotic organisms. </span> D) Photosynthesis was carried out as cyanobacteria evolved. Oxygen is a product of photosynthesis.
The
correct answers are:
B)
Oxygen is needed to carry out many life processes. The addition of oxygen to
the earth's atmosphere assisted with the development of eukaryotic organisms.
<span>D)
Photosynthesis was carried out as cyanobacteria evolved. Oxygen is a product of
photosynthesis.</span>
<span>An amphibian that lacks lungs and breathes entirely through its skin would have to be smaller than an amphibian with lungs so that the small oxygen intake correlates with
the small surface area of the amphibian. This would then allow it to breath efficiently.</span>
