Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 30, Problem 3Q
Summary Introduction
To review:
The difference in the appearance of a cnidarian population (Moerisia lyonsi) under different environmental conditions.
Introduction:
Cnidarians belong to phylum Cnidaria, which is characterized by the presence of cnidoblasts in their tentacles and presence of two distinct body forms during their life cycle. One body stage gives rise to another stage and this may also be affected by the kind of environmental conditions present, in some cnidarians such as Moerisia lyonsi.
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Among a population of tadpoles, the correlation coefficient for size atmetamorphosis and time required for metamorphosis is −0.74. On thebasis of this correlation, what conclusions can you draw about therelative sizes of tadpoles that metamorphose quickly and those thatmetamorphose more slowly?
Please choose on of the best answer that fits for this multiple choice question, Thank you
1)Consider a predator-prey relationship between crabs and sea snails. The crabs use their claws and jaws to crack open the shells of the sea snails, and so, by the principle of natural selection, any snail with a thicker shell would have an advantage and thicker shells would become more abundant. This in turn would create a selective pressure for stronger claws and jaws in the crabs, which in turn would give a selective advantage to snails with even thicker shells. This type of interaction between predators and prey is an example of
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B) coevolution
C)primary succession
D)symbiosis
E)competition
In spadefoot toads there are two forms of the tadpoles: omnivores and carnivores. Environmental factors such as population density, oxygen concentration, and availability of food determine which form any particular tadpole takes. Consider the situation below.
A single pair of toads produces a fertilized group of eggs in a pond. The pond dries a bit creating two separate ponds, one is deep and the other is shallow. All the tadpoles in the deep pond become omnivores and all the tadpoles in the deep pond become carnivores. There is a heavy rain and the ponds become connected again and the two groups of tadpoles mix together. The carnivores eat most of the omnivores and more of the carnivores become adult toads
This is an example of
Group of answer choices
A. natural selection and evolution
B. evolution only
C. natural selection only
Chapter 30 Solutions
Life: The Science of Biology
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