The scientist who is said to have discovered all the four nitrogenous bases present in the DNA of all organisms is, Erwin Chargaff, an Austro-Hungarian biochemist who immigrated to the United States. Hope this helps!
Composting because it converts left over food into soil that is rich in minerals
A 100-pound bag of makes 345 pounds of nitrogen with hydro
I’m guessing . . .
1. Roses
2. Stamens
3. Bone
4. Heart