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A stromatolite is a form of sedimentary rock created by single-celled cyanobacteria (blue-green algae) which lived in shallow saltwater seas. Black bands of iron oxides are found in these rocks dated about 3.8 to 2.5 billion years old. Recent stromatolite formations don't have these iron oxides. Stromatolites provide evident that our modern atmosphere differs from the atmosphere of ancient Earth. Which activity of the cyanobacteria is most likely the reason our modern atmosphere is different from the atmosphere of ancient Earth? Select one: a. Photosynthesis b. Nitrification c. Calcification d. Cellular respiration O O

A stromatolite is a form of sedimentary rock created by single-celled cyanobacteria (blue-green algae) which lived in shallow saltwater seas. Black bands of iron oxides are found in these rocks dated about 3.8 to 2.5 billion years old. Recent stromatolite formations don't have these iron oxides. Stromatolites provide evident that our modern atmosphere differs from the atmosphere of ancient Earth. Which activity of the cyanobacteria is most likely the reason our modern atmosphere is different from the atmosphere of ancient Earth? Select one: a. Photosynthesis b. Nitrification c. Calcification d. Cellular respiration O O

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Use the following information to answer the next question. A stromatolite is a form of sedimentary rock created by single-celled cyanobacteria (blue-green algae) which lived in shallow saltwater seas. Black bands of iron oxides are found in these rocks dated about 3.8 to 2.5 billion years old. Recent stromatolite formations don't have these iron oxides. Stromatolites provide evident that our modern atmosphere differs from the atmosphere of ancient Earth. Table 2.1 Stromatolites Which activity of the cyanobacteria is most likely the reason our modern atmosphere is different from the atmosphere of ancient Earth? Select one: a. Photosynthesis b. Nitrification c. Calcification d. Cellular respiration O O
Transcribed Image Text:Use the following information to answer the next question. A stromatolite is a form of sedimentary rock created by single-celled cyanobacteria (blue-green algae) which lived in shallow saltwater seas. Black bands of iron oxides are found in these rocks dated about 3.8 to 2.5 billion years old. Recent stromatolite formations don't have these iron oxides. Stromatolites provide evident that our modern atmosphere differs from the atmosphere of ancient Earth. Table 2.1 Stromatolites Which activity of the cyanobacteria is most likely the reason our modern atmosphere is different from the atmosphere of ancient Earth? Select one: a. Photosynthesis b. Nitrification c. Calcification d. Cellular respiration O O
A farmer has a 1 hectare corn field. If he decided to hold a corn dinner, approximately 1000 people could eat. If he fed the corn to cattle and used the cattle for a beef dinner, only 50 people could eat. This best illustrates the Select one: a. numbers loss in a food pyramid b. energy loss in a food pyramid c. numbers gain in a food pyramid d. energy gain in a food pyramid
Transcribed Image Text:A farmer has a 1 hectare corn field. If he decided to hold a corn dinner, approximately 1000 people could eat. If he fed the corn to cattle and used the cattle for a beef dinner, only 50 people could eat. This best illustrates the Select one: a. numbers loss in a food pyramid b. energy loss in a food pyramid c. numbers gain in a food pyramid d. energy gain in a food pyramid
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