During a scientific investigation, which step will a scientist perform first?

Llama have 74 chromosomes how many chromosomes will they be found in their gametes explain how you know

Between 2014 and 2016, more than 25,000 children in flint, michigan, drank water that was contaminated with lead from lead pipes. during this time, the city claimed the water was safe to drink. which of these actions could the city have taken to ensure that the drinking water was free from lead?

How many moles of no2 will form when 3.3 moles of cu are reacted with excess hno3?