Concepts of Biology
1st Edition
ISBN: 9781938168116
Author: Samantha Fowler, Rebecca Roush, James Wise
Publisher: OpenStax College
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Textbook Question
Chapter 21, Problem 2RQ
The number of currently described species on the planet is about ________.
a. 17,000
b. 150,000
c. 1.5 million
d. 10 million
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Chapter 21 Solutions
Concepts of Biology
Ch. 21 - Figure 21.6 The Svalbard seed vault is located on...Ch. 21 - The number of currently described species on the...Ch. 21 - A secondary plant compound might be used for which...Ch. 21 - Pollination is an example of ________. a. a...Ch. 21 - Converting a prairie to a farm field is an example...Ch. 21 - Which two extinction risks may be a direct result...Ch. 21 - What kind of ecosystem are exotic species...Ch. 21 - Certain species of parrot cannot be brought to the...Ch. 21 - What is the name of the first international...Ch. 21 - Explain how biodiversity loss can impact crop...
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- If two mouse populations do not interbreed but are found in the same area, they may form different species due to d. Adaptive radiation c. Spontaneous generation a. Geographic isolation b. Mutations OOOOarrow_forwardFossils 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_forwardMatch the terms with the most suitable description. ____ lineage a. measured in terms of ____ half-life reproductive success ____ fossils b. geologic change occurs ____ natural selection continuously ____ fitness c. geologic change occurs ____ uniformitarianism in unusual major events ____ catastrophism d. evidence of life in the distant past e. survival of the fittest f. characteristic of a radioisotope g. a line of descentarrow_forward
- On a sheet of paper, completes each sentence correctly. 1. The process of creating new species is 2. A(n). is made of the living and nonliving things in an area. 3. When no members of a species are alive, the species is LUord that completes eacharrow_forwardb. the fossil record d. Čell theory 18. Which of these evolves? C. genes d. all of these a. individuals b. populations minate Education TM, Inc.arrow_forwardWhich branchpoint represents the most recent common ancestor of A and C? C 2 4 -A -B 3arrow_forward
- Modern humans first entered the Americas about____ years ago, and Australia and New Guinea by at least____ years ago. a. 15,000; 200,000 b. 50,000; 20,000 c. 100,000; 200,000 d. 20,000; 50,000arrow_forwardThe first forms of life on Earth were ________. a. plants b. microorganisms c. birds d. dinosaursarrow_forwardThis tropical area that existed 37-29mya provided was home to many various species, including several primate species, including Parapithecus. a.Rukwa Rift Basin b.Hubei Province c. Fayumarrow_forward
- Life first appeared on Earth ___________ of years ago.Choose one: A. billions B. hundreds of thousands C. thousands D. millionsarrow_forwardQuestion 2 Taxonomists use or shared derived traits, to differentiate between organisms and groups of organisms. Clades Synapomorphies Nodes Parsimonies Question 3 Which number represents the most recent common ancestor of B and D? A C 3 MacBook Pro B.arrow_forwardThe Image shows four fossils found in various layers of rock. Fossil A Fossil B Fossil C Fossil D rock layers key Which statement best interprets the evidence in the rock layers? O Fossil A Is the oldest fossil. O Fossil D is the oldest fossil. O Fossil C is older than Fossil B. O Fossil B is older than Fossil A.arrow_forward
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