You are a research scientist trying to determine if the genes controlling bone density can be affected by environmental factors. What would be most useful to your research?
A. X-ray machine
B. Siblings to study
C. Mass Spectrometer
D. Identical twins to study

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

Which plate boundary causes plates to collide forming mountain ranges, volcanoes, and island arcs? give an example of this type of plate boundary. 2. at which plate boundary do rifts and mid-oceans ridges form? give an example of this type of plate boundary. 3. at which plate boundary do plates slide past each other while moving in opposite directions? give an example of this type of boundary.

Which property is best to use when determining the strength of an ionic bond in a solid lattice energy conductivity hardness solubility