Choose two of the four major divisions in the geologic time scale, describe each one and explain one way in which they were different and one way in which they were similar.

Two of the four major divisions in the geologic time scale are the Archean eon and proterozoic eon.

Explanation:

The Arcean eon is dated from 3900 million years ago to 2500 million years ago. It was in this period the oldest known rocks were deposited.  At that time the atmosphere of earth was composed of  gases like methane, carbon monoxide, ammonia etc.  

The Proterozoic eon is dated from 2500 million years ago to 540 million years ago. It was by the end of Proterozoic era that the Eukaryotas came into existence.  

There are some similarities and differences between Archean eon and Proterozoic eon.  Stromatolites formed by the colonies of cyanobacteria lived in both the eras. This is one similarity between both the eras.  

The weather in the Archean era was hot and wet while the climate and weather of proterozoic era was different from this. Proterozoic era experienced two ice ages.

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.