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

Biology Today and Tomorrow without Physiology (MindTap Course List)
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Chapter11: Evidence Of Evolution
Section: Chapter Questions
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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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