When two organisms interact with each other in order to survive it is known as a symbiotic relationship. Both the organisms living in a symbiotic relationship gain equal benefits. Mutualism, competition, parasitism , and commensalism are four main types of symbiotic relationships. When two species choose to live together it is known as facultative symbiosis and when two species live together in order to survive it is known as obligate symbiosis.

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PCBs and River Otters: Otters in Washington State’s Green-Duwamish River have high levels of polychlorinated biphenyls (PCBs) in their livers. PCBs can bind to the estrogen receptors in animals and disrupt the endocrine system of these otters. The PCBs seem to increase the estrogen to androgen ratio, skewing the ratio toward too much estrogen. How would increased estrogen affect the river otter population? Based on your reading of the materials in this unit, what factors can affect fertility in humans? Explain how each of the factors affecting human fertility that you described can disrupt the human endocrine system to affect reproduction.

Answer 1

Question

Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 29, Problem 6TY

Summary Introduction

Introduction: When two organisms interact with each other in order to survive it is known as a symbiotic relationship. Both the organisms living in a symbiotic relationship gain equal benefits. Mutualism, competition, parasitism, and commensalism are four main types of symbiotic relationships. When two species choose to live together it is known as facultative symbiosis and when two species live together in order to survive it is known as obligate symbiosis.

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PCBs and River Otters: Otters in Washington State’s Green-Duwamish River have high levels of polychlorinated biphenyls (PCBs) in their livers. PCBs can bind to the estrogen receptors in animals and disrupt the endocrine system of these otters. The PCBs seem to increase the estrogen to androgen ratio, skewing the ratio toward too much estrogen. How would increased estrogen affect the river otter population? Based on your reading of the materials in this unit, what factors can affect fertility in humans? Explain how each of the factors affecting human fertility that you described can disrupt the human endocrine system to affect reproduction.

Other than oil and alcohol, are there other liquids you could compare to water (that are liquid at room temperature)? How is water unique compared to these other liquids? What follow-up experiment would you like to do, and how would you relate it to your life?

Selection of Traits What adaptations do scavengers have for locating and feeding on prey? What adaptations do predators have for capturing and consuming prey?

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 29, Problem 6TY

Summary Introduction

Introduction: When two organisms interact with each other in order to survive it is known as a symbiotic relationship. Both the organisms living in a symbiotic relationship gain equal benefits. Mutualism, competition, parasitism, and commensalism are four main types of symbiotic relationships. When two species choose to live together it is known as facultative symbiosis and when two species live together in order to survive it is known as obligate symbiosis.

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 29, Problem 6TY

Summary Introduction

Introduction: When two organisms interact with each other in order to survive it is known as a symbiotic relationship. Both the organisms living in a symbiotic relationship gain equal benefits. Mutualism, competition, parasitism, and commensalism are four main types of symbiotic relationships. When two species choose to live together it is known as facultative symbiosis and when two species live together in order to survive it is known as obligate symbiosis.

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Answer 4

Question

Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 29, Problem 6TY

Summary Introduction