Answer:
iron, copper, zinc, cobalt, molybdenum, selenium, chromium, iodine
Explanation:
An element is a trace element when its below 100 mg.
all can harm when extreme
1. The group nearest the end or with the shortest stem of a phylogenetic tree has evolved most recently. In this case it is eutherians.
2. The group with the longest stem has been around the longest: fish
3. A direct common ancestor will share the same immediate line, like marsupials and eutherians. Fish and marsupials do not have a common direct ancestor.
