Figure 21.2 Use This Illustration to Answer the Following Questions

question 19

Multiple Choice

Figure 21.2
Use this illustration to answer the following questions.
-Identify the letter that indicates the large lymph vessel that drains three-quarters of the body.

• A) A
• B) B
• C) C
• D) D
• E) E

Explain the concept of niches and the effect of species interactions on niche dimensions.

Identify the role and characteristics of keystone species within ecological communities.

Recognize the importance of mutualism and its impact on species interactions and community structure.

Assess the implications of environmental and biological changes on disease dynamics and parasite-host interactions.

---

Definitions:

Percent

A way to express a number as a fraction of 100, denoting proportions or ratios.

Economic Discrimination

The unfair treatment of individuals based on their economic status, gender, age, or ethnicity influencing their opportunities and resources.

Discrimination

Discrimination refers to the unjust or prejudicial treatment of different categories of people, especially on the grounds of race, age, or sex.