The Two-Sided Attack on the Spiny Cactus The spiny cactus is a type of plant that lives in a desert environment. A population of spiny cact shows variation in the number of spines on their outer surfaces. The graph below shows the distribution of the number of spines before the introduction of collared peccaries and parasitic wasps Spiny Cactus Organism Collared peccaries and parasitic wasps are two organisms that were introduced to the ecosystem in which the spiny cactus population lives. The chart describes the relationship between the spiny cact and these two organisms Collared peccary (musk hog) 100- Parasitic wasp LUL 70 80 90 100 110 120 130 Number of Spines Organisms Introduced into the Ecosystem Relationship with Spiny Cactus Plants They eat spiny cactus plants that have a small number of spines. They lay eggs at the base of cactus spines. When the eggs hatch, the emerging grubs dig into the interior of the cactus and eat the inner pulp of the plant, usually destroying the plant These wasps lay eggs on spiny cactus plants that have a large number of spines A student wants to make a chart showing the general trend in the change in the distribution for the number of spines over time for this population. Drag and drop the values into the chart to BEST represent the distribution after natural selection has acted on this population for many years after the introduction of the collared peccaries and parasitic insects. Each value should be used but can only be used once. Number of Spines 70 80 90 100 110 120 130 Number of Cacti

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Chapter16: Population Ecology
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The Two-Sided Attack on the Spiny Cactus
The spiny cactus is a type of plant that lives in a desert environment. A population of spiny cact shows variation in the number of spines on their outer surfaces. The graph below shows the
distribution of the number of spines before the introduction of collared peccaries and parasitic wasps.
Spiny Cactus
Organism
Collared peccary
(musk hog)
Collared peccaries and parasitic wasps are two organisms that were introduced to the ecosystem in which the spiny cactus population lives. The chart describes the relationship between the spiny
cacti and these two organisms
Parasitic wasp
100-
o
70 80 90 100 110 120 130
Number of Spines
Organisms Introduced into the Ecosystem
C2022 Iluminate Education, Inc.
Relationship with Spiny Cactus Plants
They eat spiny cactus plants that have a small number of spines.
They lay eggs at the base of cactus spines. When the eggs
hatch, the emerging grubs dig into the interior of the cactus.
and eat the inner pulp of the plant, usually destroying the plant.
These wasps lay eggs on spiny cactus plants that have a large
number of spines.
A student wants to make a chart showing the general trend in the change in the distribution for the number of spines over time for this population.
Drag and drop the values into the chart to BEST represent the distribution after natural selection has acted on this population for many years after the introduction of the
collared peccaries and parasitic insects. Each value should be used but can only be used once.
Number of Spines
70
80
90
100
110
120
130
Number of Cacti
Transcribed Image Text:The Two-Sided Attack on the Spiny Cactus The spiny cactus is a type of plant that lives in a desert environment. A population of spiny cact shows variation in the number of spines on their outer surfaces. The graph below shows the distribution of the number of spines before the introduction of collared peccaries and parasitic wasps. Spiny Cactus Organism Collared peccary (musk hog) Collared peccaries and parasitic wasps are two organisms that were introduced to the ecosystem in which the spiny cactus population lives. The chart describes the relationship between the spiny cacti and these two organisms Parasitic wasp 100- o 70 80 90 100 110 120 130 Number of Spines Organisms Introduced into the Ecosystem C2022 Iluminate Education, Inc. Relationship with Spiny Cactus Plants They eat spiny cactus plants that have a small number of spines. They lay eggs at the base of cactus spines. When the eggs hatch, the emerging grubs dig into the interior of the cactus. and eat the inner pulp of the plant, usually destroying the plant. These wasps lay eggs on spiny cactus plants that have a large number of spines. A student wants to make a chart showing the general trend in the change in the distribution for the number of spines over time for this population. Drag and drop the values into the chart to BEST represent the distribution after natural selection has acted on this population for many years after the introduction of the collared peccaries and parasitic insects. Each value should be used but can only be used once. Number of Spines 70 80 90 100 110 120 130 Number of Cacti
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