What provides evidence of an increase in animal species at the same time that atmospheric oxygen concentrations increased?(1 point) Responses stromatolites stromatolites fossil record fossil record rust deposits rust deposits anaerobic organisms
The correct answer is stromatolites. Stromatolites are layered sedimentary structures formed by the trapping and binding of microorganisms, including early forms of bacteria and algae. They are commonly found in ancient rock formations and provide evidence of early life on Earth. Stromatolite formations have been found to coincide with periods of increased atmospheric oxygen concentrations, indicating a connection between increased oxygen and the proliferation of animal species.
The correct answer to the question, "What provides evidence of an increase in animal species at the same time that atmospheric oxygen concentrations increased?" is the fossil record. The fossil record offers evidence of the presence and diversity of animal species from different time periods in Earth's history. By examining fossilized remains, scientists can infer the existence and abundance of animal populations during certain periods of time. In this case, the increase in animal species coincided with the rise in atmospheric oxygen concentrations.
To find evidence of an increase in animal species at the same time atmospheric oxygen concentrations increased, we need to examine clues from the past. The most relevant options provided are stromatolites, the fossil record, and rust deposits. Let's evaluate each option to determine the most appropriate choice.
1. Stromatolites: These are layered rock-like structures formed by microorganisms like cyanobacteria (blue-green algae) in ancient aquatic environments. Stromatolites can indicate the presence of oxygen-producing organisms in the past, which could coincide with an increase in atmospheric oxygen levels.
2. Fossil record: The fossil record encompasses the preserved remains or traces of ancient organisms found in rocks. By studying fossilized animal remains, paleontologists can gather information about the diversity and abundance of different species that existed in different time periods, possibly coinciding with increased oxygen levels.
3. Rust deposits: Rust deposits, also known as iron oxide deposits, can form in environments where oxygen reacts with iron-bearing minerals. However, they typically do not provide evidence directly related to an increase in animal species.
Based on these options, both stromatolites and the fossil record could provide evidence of an increase in animal species during a period of increasing atmospheric oxygen concentrations. However, as stromatolites are primarily associated with microbial life rather than animal species, the fossil record may be a more suitable choice to directly indicate the abundance and diversification of animal species during this time.
Therefore, the most appropriate response would be "fossil record."