Other cities followed and tube systems were opened not only for the transport of telegrams but also for individual letters and for letters in bulk.	Stems transport water to other parts of the plant through a system of tubes.	neutral
This very fast-moving stream of air is a jet stream .	The best explanation for how air masses move across the united states is that the prevailing westerlies move air masses from west to east across the united states but may be deflected by the jet stream.	neutral
But is it possible for the same substance to burn differently according to size?	Wood burning is an example of a different substance being formed.	neutral
(Include flowering trees, such as apple &amp; cherry blossoms.)	A sign that an apple tree is going to start growing apples is that the tree has flowers.	neutral
Programming: The length of the Summer Festival has increased from 10 to 17 days.	A(n) increase in length happens to metal railroad tracks during the heat of a summer day.	neutral
Stable isotopes in sedimentary rocks and fossils.	Most fossils are found in sedimentary rocks because organisms can be preserved in sedimentary rock.	neutral
Insects) Title: How to identify acorn weevils Description: Most people will never have a chance to observe the adult acorn weevil unless they climb high in an oak tree.