When did photosynthetic organisms first appeared? O From the very beginning of life, they are some of the earliest fossils O Sometime after the first prokaryotes appeared O At about the same time when eukaryotes appeared on the fossil record O A while after the first eukaryotes appeared O At about the same time when chloroplasts appeared on the fossil record Calculator !!!

When did photosynthetic organisms first appeared? O From the very beginning of life, they are some of the earliest fossils O Sometime after the first prokaryotes appeared O At about the same time when eukaryotes appeared on the fossil record O A while after the first eukaryotes appeared O At about the same time when chloroplasts appeared on the fossil record Calculator !!!

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter18: Life's Origin And Early Evolution

Section: Chapter Questions

Problem 15SA: Arrange these events in order of occurrence, with 1 being the earliest and 6 the most recent: ___1...

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Chronologically arrange the evolutionary events, with 1being the earliest and 6 the most recent.___ 1 a. onset of oxygen-releasing___ 2 pathway of photosynthesis___ 3 b. liquid water appears___ 4 c. origin of protocells___ 5 d. emergence of the first___ 6 eukaryotes e. origin of chloroplasts f. the big bang
why was the first mini threshold of life's evolution, photosynthesis, so important? a. it helped plants move onto land b. it transformed our atmosphere from oxygen-rich to carbon dioxide-rich c. it allowed life to spread beyond oceanic vents d. it forced organism to become multicellular to process more complex energy
The first interval of Earths existence is called the ________. a. Cambrian c. Proterozoic eon b. Hadean eon d. Archean eon
The Cambrian radiation (a) occurred during the late Cambrian period (b) was a rapid evolution of new animal body plans during the middle Cambrian (c) was a result of prokaryotic and eukaryotic migration to many new regions (d) is supported by the great variety of Ediacaran fossils (e) b and c
An abundance of___________ in Earths early atmosphere would have prevented the spontaneous assembly of organic compounds on early Earth. a. hydrogen b. methane c. oxygen d. nitrogen
During the Precambrian, _______. a. atmospheric oxygen concentration declined b. bacteria, archaea, and early eukaryotes arose c. dinosaurs became extinct d. all of the above
What event is thought to have contributed to the evolution of eukaryotes? a. global warming b. glaciation c. volcanic activity d. oxygenation of the atmosphere
Which of the following is not a fossil? a. Dried-out animal bones in a layer of desert sand b. A patch or fur encased in amber c. A woolly mammoth frozen in Arctic permafrost d. Remains of an extinct whalelike animal e. The impression of a p1ant leaf in sandstone f. The wrinkly texture of shale imprinted with biofilms in sediments
Which of the following is a fossil? a. an insect encased in 10-millon-year-old tree sap b. a woolly mammoth frozen in Arctic permafrost for the last 50,000 years c. mineral-hardened remains of a whalelike animal found in an Egyptian desert d. an impression of a plant leaf in a rock e. all of the above can be considered fossils
Which of the following is NOT true of conditions during the Hadean eon? a. The atmosphere held no oxygen. b. Rocks began to rust. c. Volcanic eruptions were common d. Meteorites struck the Earth continually.
The evolution of ________ resulted in the eventualformation of the ozone layer.a. DNA-based genomesb. aerobic respirationc. sexual reproductiond. oxygen-producing photosynthesis
Plant photosynthesis transformed a very large amount of atmosphericcarbon dioxide into decay-resistant organic compounds, thereby causinga dramatic decrease in atmospheric carbon dioxide levels during thegeological period known as thea. Cambrian.b. Ordovician.c. Carboniferous.d. Permian.e. Pleistocene.