What is the method of harvesting trees during logging where a small number of mature trees are left intact called ?it’s for a crossword puzzle and it consists of two words and together they should have 17 letters

Try “seed tree approach”, maybe? 17 letters...seedtrees approach?

It’s not clear cutting, and the other names I found are shelterwood system and selection harvesting.

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom

The metal is named first