Which of the following best summarizes the author's thesis in the passage? A
The heat produced by power plants often attracts congregations of marine life such as jellyfish.
B
Many disruptions that are attributed to human activity are actually triggered by natural causes.
С
Expanding populations of jellyfish are causing increasing problems in many parts of the world.
D
Predation by jellyfish poses a significant threat to commercial fisheries worldwide.
E
Jellyfish have recently developed adaptations that enable them to live in a wider variety of ocean environments.

C. Expanding populations of jellyfish are causing increasing problems in many parts of the world.

Explanation:

Passage begins by describing odd reproduction of jellyfish, followed with examples of the many problems the jellyfish cause.

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

the caste system in india is the paradigmatic ethnographic example of caste. it has origins in ancient india, and was transformed by various ruling elites in medieval, early-modern, and modern india, especially the mughal empire and the british raj.it is today the basis of educational and job reservations in india.it consists of two different concepts, varna and jati, which may be regarded as different levels of analysis of this system.

the caste system as it exists today is thought to be the result of developments during the collapse of the mughal era and the british colonial regime in india. the collapse of the mughal era saw the rise of powerful men who associated themselves with kings, priests and ascetics, affirming the regal and martial form of the caste ideal, and it also reshaped many apparently casteless social groups into differentiated caste communities.the british raj furthered this development, making rigid caste organisation a central mechanism of administration

i didn’t fully understand your question but i hope this you !