When the environmental protection agency (epa) specified that the congressional mandate to provide clean drinking water would be interpreted as meaning water could have no more than .01 microgram per liter of arsenic and still be considered safe for drinking, it exercised the power of?

The answer is Rulemaking

Explanation:

Rulemaking is the process federal agencies use to make new regulations. These regulations affect everything related to individuals in USA soil. From the water to the health care and financial security. The congress passes the broad statues that govern the population, but most of the details are left to federal agencies to establish during the rulemaking process.

The purpose of the new regulations is to fix, solve certain issues or to achieve some goals.

parasites can detrimentally affect their host, but also must not allow their host to die before they can complete their life cycle. some parasites have complex life cycles with many different hosts, and have had to find ways of persisting in many different environments during the change from one host to another. ectoparasites live outside the body of the host, and can more easily  disperse, but are  more exposed to predators, parasites, parasitoids. endoparasites live inside the body of the host, and are therefore protected from the outside environment. but they can be  attacked by the host's immune system. they have therefore developed  mechanisms for dispersal such as  complex life cycles.

what are the awnser choices? i mean, without choices, it is an incompleat