What would happen if rats was eliminated from the environment

Rats account for a decent amount of biomass globally.  They are intermediate predators, eating a lot but also being eaten.  If they went extinct, they would stop eating many insects and seeds / fruits -- the former would gain significantly in population, and the latter would lose some of their pollination.  Both factors would harm the viability of at least some species of plants, by adding to plant eaters (insects) and reducing plant reproduction.  Rats' predators would also suffer if they went extinct.  The primary predators are birds of prey, such as hawks and owls.  However, other animals such as skunks, foxes, weasels, coyotes, and even wolves eat rats.  For predators in marginal environments, the loss of such a food source could drive them out of a habitat area.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.