The distinction between sensation and perception group of answer choices
a) is important to the understanding of bottom-up and top-down processing
b) allows researchers to identify the "elementary" processes that perception builds upon is clear and
c) allows researchers to distinguish between information processed by the receptors versus the information processed in the cortex.
d) is not always obvious and, thus, does not aid us in our understanding of perception.

Read this summary of a scientific theory: "cells are the most basic structural and functional units of life. all living organisms are made up of one or more cells. all cells that are alive in the world today came from pre-existing cells." which of the following would require this theory to be modified? -a.) a survey finds that a majority of people believe viruses carry out the basic processes of life. -b.) a prominent scientist says she feels strongly that one day the theory will be challenged by life on other planets. -c.) the dna of unicellular and multi-cellular organisms is shown to have many fundamental similarities. -d.) scientific observations show that microscopic organisms living in the deep ocean are not made up of cells.