You can choose from in-person surveys (one-on-one interviews carried out at high-traffic locations), telephone surveys (less expensive than one-to-one interviews), mail surveys (easy to reach a large audience) and online surveys (simple and inexpensive way to collect data, though not reliable).
A binary tree of depth d is an almost complete binary tree if: 1  Each leaf in the tree is either at level d or at level d â 1. 2  For any node nd in the tree with a right descendant at level d, all the left descendants of nd that are leaves are also at level d.
So - there are evergreen (coniferous) and broadleaved (deciduous) trees: Coniferous = cone bearing Deciduous = leaf dropping The leaves of a deciduous tree are generally broad and flat. The leaves of a conifer are generally needles, and are thin and pointy. The leaf area is the primary area of photosynthesis in any tree. Deciduous trees tend to drop their leaves annually at the end of the growing season during Autumn, whilst conifers retain theirs all through the winter.