Andy sets up an experiment with the goal of determining the coefficient of static friction between a wooden block and a wooden surface. he uses a spring scale to weigh a wooden block. he then places the block on a plane and inclines it until the block begins to slide. the angle of slip is recorded. andy repeats the experiment using a variety of materials to cover the board. he recorded the data in a table. andy did not distinguish between types of sandpaper. how would running two trials, one with fine sandpaper and another using coarse sandpaper, impact his results?

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.

Select the correct answer. what does the hardy-weinberg principle relate to? a. chances of survival of an organism b. frequency of alleles in a population c. natural selection in a species d. causes of evolution among organisms

Which rate indicates the number of children that would be born per women if she were to live to the end of her child-bearing years