Which improves the integrity of an experimental investigation? 1. Keeping as few constants as possible
2. Having several (at least 2-3) independent variables
3. Keeping everything constant except the independent and dependent variable

answer; i believe its echoic memory,it is believed to last three to four seconds; good luck

one would be wind another would be water density

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.