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15. How does a phylogenetic tree assist in studying the evolution of mussels?

a) It helps determine the geographical distribution of different mussel species.
b) It shows the age of various mussel species in relation to one another.
c) It provides insights into the genetic diversity among different mussel populations.
d) It illustrates the evolutionary relationships and ancestry of mussel species.

7 answers

d) It illustrates the evolutionary relationships and ancestry of mussel species.

A phylogenetic tree represents the evolutionary pathways and connections between different species, helping researchers understand how mussels are related in terms of their evolutionary history.

16. Which of the following statements is true about how interconnected watersheds are?
a) Watersheds are isolated from one another, and their health has no effect on neighboring watersheds.
b) The health of one watershed does not affect the health of neighboring watersheds.
c) Watersheds can be interconnected, and one's health can impact the health of others downstream.
d) Watersheds are connected to the global ocean but not to other watersheds.

c) Watersheds can be interconnected, and one's health can impact the health of others downstream.

This statement correctly reflects the concept that watersheds are part of a broader hydrological system where water, pollutants, and nutrients can flow from one watershed to another, affecting their overall health and ecosystem.

17. Which of the following describes a bioindicator in a freshwater ecosystem?
a) Endangered species found in freshwater environments.
b) Organisms used to control invasive species in freshwater habitats.
c) Indicator species that are exclusively found in marine environments.
d) Organisms that reflect the health and condition of a freshwater
ecosystem.

d) Organisms that reflect the health and condition of a freshwater ecosystem.

Bioindicators are species or groups of organisms that provide information about the quality of the environment, such as the health of a freshwater ecosystem, based on their presence, absence, or condition.

18. Invasive species, like zebra mussels, often thrive in new environments because…
a) they have natural predators that control their population.
b) they possess unique genetic traits that make them resilient to environmental changes.
c) they have symbiotic relationships with native species that aid their survival.
d) they lack competitors and predators in their new environment.

d) they lack competitors and predators in their new environment.

Invasive species, such as zebra mussels, often thrive in new environments because they are introduced into ecosystems where they have no natural predators or competitors, allowing them to spread rapidly and outcompete native species.