<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>
