Which type of leaf is represented by letter D? A) White Oak

B) White Spruce

C) American Beech

D) Eastem White Pine​

When analyzing tree rings, what do scientists assume a thin ring indicates?

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of

Amines amides and amino acids are categories of