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

What is the chemical formula of the following compound

Imagine that twenty i. u.’s of enzyme z were catalyzing the above reaction for one minute, under vmaxconditions, in a 3.00 ml assay volume. the assay is buffered with 20 mm phosphate buffer, ph 7.60. what will the ph be at the end of that one minute?

Which property of a rock remains unchanged by mechanical weathering? a. total surface area b. size and shape c. mineral composition d. sharpness