21.   Each of these maladies is believed to have been spread to vulnerable trees by the movement of people.

22.   For most of the history of science, experts have drawn the tree by comparing the gross surface features of various creatures.

23.   Grandma turns her head slightly, as if listening to the screech owl who used to perch in a tree by the barn at night.

24.   Get to the root of the matter when watering trees by surrounding them in a Treegator, a portable drip irrigation system.

25.   He communes with trees by measuring their dimensions.

26.   He selected his trees by finding the grower of an Italian oil he admired and importing saplings to his Healdsburg ranch.

27.   Highly prolific, it is considered a weed tree by some and a lovely ornamental by others.

28.   However, tamarisk out-competes these trees by devouring their water sources and poisoning the soil with salt.

29.   I defuse leaves that fall under my trees by mowing thoroughly.

30.   I hid behind a tree by the river and, then, all of a sudden, I fell asleep.