Miller and Levine Biology
Miller and Levine Biology
1st Edition
Joseph S. Levine, Kenneth R. Miller
ISBN: 9780328925124
Textbook solutions

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Page 185: Review

Exercise 1
Result
1 of 1
Ecological succession, which refers to the changes that take over in a particular ecosystem, happens due to several reasons:

a. When species alter the environment, they change it in such a way that would help them to adapt to it easier.

b. It adds complexity to the environment and enables more species to live in it. This event causes the species diversity to increase.

Exercise 2
Step 1
1 of 2
Secondary succession refers to the process of taking over a land where the residue from the previous ecosystem are still seen. It usually occurs after a natural disturbance, wherein a healthy ecosystem is devastated when living organisms are wiped out and their shelters are damaged.

The factors that affect the paths of a secondary succession includes the following: the type of disturbance, the season when the disturbance occurs, and other human activities, such as deforestation.

Result
2 of 2
The factors that affect the paths of a secondary succession includes the following: the type of disturbance, the season when the disturbance occurs, and other human activities, such as deforestation.
Exercise 3
Result
1 of 1
In a secondary succession, the remnants from the previous ecosystem are still visible. This indicates that the regrowth of vegetation and recovery of the ecosystem in the second succession is quicker than the primary succession, which occurs in a barren or undeveloped land.
Exercise 4
Result
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In this event, competition and succession played a role in the bacterial infection. Oftentimes, bacteria that live in proximity compete with each other for space, nutrients, or resources. When the antibiotic is introduced to the patient, it altered the gut’s microbiome and killed most of the bacteria, even the good ones.

However, taking the antibiotics for several weeks has exposed the bacteria to weak or non-lethal quantities of the drug. Due to natural selection, a succession took place. The next generation evolved and developed defenses that would make them resistant to the drug. As a result, a progressive bacterial growth and a more severe infection usually take place.

The evidence that would support the doctor’s claim would include the recurrence of the same kind of bacteria in the patient’s gut, In addition, one possible evidence is the low count of good bacteria that fight bacterial infection, which indicates an unfavorable change in the microbiome of the patient’s gut.

Exercise 5
Result
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The environmental conditions of a tropical rainforest and a farm are completely different from each other. Most of the time, when a forest is cleared for farming, the microclimate and soil condition are changed. As a result, the original community is not going to be fully restored.
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