Sarah performs an experiment to determine the effect of nitrogen on plants. She studies the effect of nitrogen on the growth of the root hair, height of the plants, and nodule formation. Which factor is an independent variable? A.
amount of nitrogen
B.
growth of root hair
C.
nodule formation
D.
height of the plants

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates

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

Diego conducted an experiment to find out what kind of ball bounces the highest when dropped from a five-foot platform. he used a golf ball, a tennis ball, and a soccer ball. he dropped each ball from the balcony once. diego recorded his observations after each drop. what can diego do to best improve the reliability of his results? a) drop each ball from the platform three more times b) record his observations in more than one unit c) write at least two scientific questions after the experiment is complete d) share his results with other people who have done similar experiments you for the !