Identify the structures on the right. Label A

Label B

Label C

Label D
4 structures are labeled. Part A is a double-helix structure. Part B is a long, wrapped structure. Part C is an x-shaped structure. Part D is a large round structure with chromosomes inside.

Does anyone know a lot about how to: - calculate mass of magnesium metal - calculate the actual yield of magnesium oxide - calculate the theoretical yield of mgo - calculate the percent yield of mgo - determine the percent yield of mgo - determine the average percent yield of mgo i had to do an online lab and its asking these questions but i have no idea where to start or how to be able to find these things. i can post the chart of the data from the lab or if you can tell me exactly how i can find each.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays