To test the quality of water sources in her area, Shameka collects five samples from each water source and tests the quality of each sample. Which important step of scientific design is Shameka conducting? and do not say c cause it is not thank you please hurry

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

hello

answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%