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How does the means of gas exchange differ by the relative age (evolutionarily) of each group?
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- Before the emergence of life of what gases was the earth's primitive atmosphere constituted?How the evolution of oxygen was involved in the initial evolution of terrestrial life?How is the respiratory system in aquatic molluscs characterized? What adaptive respiratory structure do terrestrial molluscs present?
- The oxygen revolution permanently changed Earth’s environment and dramatically impacted the evolutionary history that followed. Answer ALL the questions related to this phenomenon, below. Give the span of geological timewhen the oxygen revolution occurred. Provide oneline ofevidence for the oxygen revolution. What evolutionary novelty(complex metabolic pathway) enabled these new organisms to release so much O2? Organisms with what kind of metabolismprobably went extinctbecause of the oxygen revolution? What kind of metabolism, not possible before, likely evolved in responseto the oxygen revolution?16) The following statements concern organisms called stromatolites. Which statements are true and which are false? Correct the false statements. The oldest fossil stromatolites are between 3.5 and 3.9 billion years old. No stromatolites are alive today. Ancient stromatolites were composed of microbial mats layered with sediments. The first stromatolites could fix CO2, but they did not produce O2. Stromatolites form around deep sea vents. Another name for stromatolites is “banded iron formations”. 17) Multicellularity is an important evolutionary innovation in the history of life on Earth. For the following statements, designate which is true (T) and which is false (F). Correct the false. Multicellularity has evolved independently a few times in the history of life. Multicellular members of domain Eukarya arose through the process of endosymbiosis. Multicellular organisms have cells specialized for different functions, with each cell type…In which probable stage of physical and chemical evolution of life were gaseous oxygen and water also present?
- The oxygen revolution changed Earth’s environmentdramatically. Which of the following took advantage of thepresence of free oxygen in the oceans and atmosphere?(A) the evolution of cellular respiration, which used oxygen tohelp harvest energy from organic molecules(B) the persistence of some animal groups in anaerobichabitats(C) the evolution of photosynthetic pigments that protectedearly algae from the corrosive effects of oxygen(D) the evolution of chloroplasts after early protists incorporated photosynthetic cyanobacteriaDiscuss the diversity of gas exchange you have observed in Arthropoda?The researchers found that the Neanderthal fossil had approximately0.0078 as much 14C as found originally in the atmosphere. (a) Usingthe numbers on your graph, determine how many half-lives havepassed since the Neanderthal died. (b) Using your 14C calibration onthe x-axis, what is the approximate age of the Neanderthal fossil inyears (round off to the nearest thousand)? (c) Approximately whendid Neanderthals become extinct according to this study? (d) Theresearchers cite evidence that modern humans (H. sapiens) becameestablished in the same region as the last Neanderthals approximately 39,000–42,000 years ago. What does this suggest aboutthe overlap of Neanderthals and modern humans?