Answer:
The mass number is 56
Explanation:
You just add the number of protons and neutrons to find the mass number of a atom.
All cells have a nucleus in the middle of it (Hope that helps)
Answer:
An air mass that originates over land in Central America is most likely warm & dry.
Explanation:
Vascular tissue
Of course plants don't have hearts, but they do have vessels which transport water, minerals, and nutrients through the plant. These vessels are the vascular tissue.
