18. Give examples of the major groups of organisms present during different time periods in the history of life on Earth? a. During the Paleozoic era, the major groups of organisms present were dinosaurs and mammals b. During the Mesozoic era, the major groups of organisms present were amphibians and reptiles. c. During the Cenozoic era, the major groups of organisms present were birds and mammals. d. During the Precambrian time period, the major groups of organisms present were bacteria and algae.

18. Give examples of the major groups of organisms present during different time periods in the history of life on Earth? a. During the Paleozoic era, the major groups of organisms present were dinosaurs and mammals b. During the Mesozoic era, the major groups of organisms present were amphibians and reptiles. c. During the Cenozoic era, the major groups of organisms present were birds and mammals. d. During the Precambrian time period, the major groups of organisms present were bacteria and algae.

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter11: Evolution And Its Processes

Section: Chapter Questions

Problem 8RQ: The wing of a bird and the arm of a human are examples of ______. a. vestigial structures b....

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Which of these steps probably occurred first in the chemical andbiological evolution of life?a. The cell membrane of a protobiont formed.b. The first organic molecules formed.c. The original genetic material was RNA.d. Simple organic monomers formed from inorganic materials.
The Cambrian Explosion occurred approximately 542 million years ago. During the Cambrian, what ‘exploded’? a. The diversity of species on Earth, including many major animal phyla that exist today b. The Yucatan Peninsula, which was hit by an asteroid c. The quantity of oxygen in the atmosphere due to the expansion of coniferous forests d. Numerous volcanoes worldwide, leading to the fourth mass extinction
Why was the Mesozoic era extinction significant to the history of mammals? a. As photosynthesis slowed, meat-eating mammals prevailed. b. Fewer plankton species meant more open ocean ecosystems for large, aquatic mammals. c. Dinosaur extinctions opened up new habitats to mammals. d. Only the smartest primates knew how to survive the extinction.
In which type of rock are you most likely to find a fossil? a. basalt, a dark, fine-grained volcanic rock b. limestone, composed of sedimented calcium carbonate c. slate, a volcanically melted and cooled shale d. granite, which forms by crystallization of magma cooling below Earth’s surface
What is the term for bits of rock and dirt? O A. Mesozoic O B. Half-life O c. Sediment O D. Radiometric
Which of the following groups of early-diverging animals is comprised of two layers of cells that float around in the ocean? a. Cnidaria b. The sponges c. Ctenophores d. Placozoa
what key trait of life developed with the emergence of multicellular organism, the third threshold in the evolution of life? a. metabolism b. adaptation c. homeostasis d. reproduction
The first forms of life on Earth were a. plants b. microorganisms c. birds d. dinosaurs
What type of data is primarily used to determine the existence and appearance of early animal species? a. molecular data b. fossil data c. morphological data d. embryological development data
Which of the following was not present by the end of Precambrian? a. archaea c. fungi b. bacteria d. fish
The wing of a bird and the arm of a human are examples of ______. a. vestigial structures b. molecular structures c. homologous structures d. analogous structures
According to "Life and Death 3MYA", what are the Laetoli footprints? A.Fossilized footprints of Neanderthals walking across the landscape thousands of years ago B.Fossilized footprints and handprints of Australopithecines walking on all fours across the landscape millions of years ago C.Fossilized footprints of Ardi walking across the landscape millions of years ago D.Fossilized footprints of Australopithecines walking across the landscape millions of years ago