Final Answer:
David is a research scientist who is giving a lecture to a class of students on how life began on Earth. Help him complete the sentences. Scientists have found stromatolites containing fossilized cyanobacteria (blue-green algae). They show that life has been present on the Earth from early ages. Oparin and Haldane were two scientists who hypothesized that life needed reducing environments initially to appear. The ocean in the early ages was anoxic and acidic.
Step-by-step explanation:
Scientists have found stromatolites containing fossilized cyanobacteria (blue-green algae). They show that life has been present on Earth from early ages. Oparin and Haldane were two scientists who hypothesized that life needed reducing environments initially to appear. The ocean in the early ages was anoxic and acidic.
Stromatolites, geological formations formed by microbial mats, notably cyanobacteria, provide evidence of ancient life dating back billions of years. These structures reveal the presence of early life forms and their role in shaping Earth's early ecosystems. Oparin and Haldane's hypotheses proposed that life originated in an environment devoid of oxygen, which aligns with the notion of an anoxic ancient ocean. This lack of oxygen, combined with high acidity levels in the early oceans, reflects the extreme conditions that likely characterized the emergence of life on our planet.
Correct Answers: Stromatolites, anoxic