A hiker is walking through an apple orchard growing two varieties of apple trees - Festival and Cool Crisp. This person notices that the leaves of all the trees are curled. This person wonders, "Are all apple leaves curled?"
In order to answer the hiker's question, which of the following would be the most useful hypothesis?
A. Some apple leaves are curled and others are not.
B. Apple leaves may be curled.
C. All apple leaves are curled.
D. If a leaf is from a fruit tree, then it will be curled.

10 years is the answer

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.