BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Textbook Question
Chapter 18, Problem 2SA
The first interval of Earth’s existence is called the ________.
| a. Cambrian | c. Proterozoic eon |
| b. Hadean eon | d. Archean eon |
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The first forms of life on Earth were ________. a. plants b. microorganisms c. birds d. dinosaurs
The fossil record shows how ________________
a. dead organisms were buried
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d. evolution occurred
The first forms of life on Earth were thought to be_________. a. single-celled plants b. prokaryotes c. insects d. large animals such as dinosaurs
Chapter 18 Solutions
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Ch. 18 - An abundance of___________ in Earths early...Ch. 18 - The first interval of Earths existence is called...Ch. 18 - The prevalence of ironsulfur cofactors in...Ch. 18 - Miller and Urey created a reaction chamber that...Ch. 18 - RNA in ribosome catalyzes formation of peptide...Ch. 18 - By one hypothesis, clay________. a. facilitated...Ch. 18 - Photosynthesis carried out by one group of...Ch. 18 - Mitochondria are most closely related to...Ch. 18 - The presence of ozone in the upper atmosphere...Ch. 18 - A ribozyme consists of ___________. a. clay c. DNA...
Ch. 18 - A rise in oxygen in Earths air and seas set the...Ch. 18 - Which of the following was not present by the end...Ch. 18 - The first chloroplasts evolved from ___________....Ch. 18 - During the Precambrian, _______. a. atmospheric...Ch. 18 - Arrange these events in order of occurrence, with...Ch. 18 - Researchers looking for fossils of the earliest...Ch. 18 - Rickettsia bacteria always live as parasites...
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- Which of the following do not provide evidence that a meteor strike was a partial cause of the Cretaceous-Paleogene mass extinction? a. A potential meteor crater off the coast of Mexico b. High layers of iridium in soil deposits in the geologic record at that time c. Shocked quartz was formed in large quantities at that time around the potential impact site d. An ozone hole appeared in the atmosphere at the time of the meteor strikearrow_forwardLife first appeared on Earth ___________ of years ago.Choose one: A. billions B. hundreds of thousands C. thousands D. millionsarrow_forwardWhich of the following is characteristic of the end of the Paleozoic Era? a There was a mass extinction that eliminated 70% of marine life. b All of Earth's landmasses are joined together in a supercontinent called Pangaea. c Mountains began to form. d The supercontinent Pangaea separated into present-day continents.arrow_forward
- Most animal lineages evolved during the ____ period. a. Devonian b. Cambrian c. Silurian d. Cretaceous e. Ordovicianarrow_forwardIn which era did humans first appear on Earth? O A. Paleozoic O B. Mesozoic C. Precambrian O D. Cenozoicarrow_forwardMartian meteorites found in Antarctica were determined to possibly contain life. Scientists looked skeptically at these meteorites because a. their results suggest unusual chemical signatures that do not indicate life. b. features thought to be Martian fossils could be nonbiochemical formations. c. it is impossible for a piece of the Martian surface to fall to Earth. d. both a and b are true.arrow_forward
- Fossils found in deeper layers of the Earth generally have ____ 14C than fossils found in the upper layers. a. more c. the same amount of b. less d. different types ofarrow_forwardThe 3.6-million-year-old footprints left by bipedal walkers in Tanzania were probably made by_____ . a. australopiths c. modern humans b. Neanderthals d. Homo erectusarrow_forwardThe____ tool industry characterizes the Middle Paleolithic / Middle Stone Age and spans the time from____ - ____ years ago. a. Acheulean; 1 million - 500,000 b. Oldowan; 200,000 - 100,000 c. Mousterian; 300,000 - 40,000 d. Mousterian; 100,000 - 10,000arrow_forward
- Through______ , a body part of an ancestor is modified differently in different lines of descent. a. homologous evolution c. analogous evolution b. convergent evolution d. divergent evolutionarrow_forwardThe fossil record shows that in just the last 600 million years, there have been five instances of sharp decreases in the diversity and abundance of living organisms. what are these events? a. droughts b. mass extinctions c. reversals of the earth's magnetic field d. great migrationarrow_forwardThe evolution of various life forms on Earth is summarized in ________. a. the binomial naming system b. phylogenetic trees c. the taxonomic classification systemarrow_forward
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