The paleozoic era is the longest time period in the history of earth.

FALSE

Explanation:

The Paleozoic era is not the longest of all the era. It started from the Cambrian that was about 545 million years ago and ended in the Permian that was about 250 million years back.

The longest of all the era is the Precambrian era that started right from the time of formation of the earth that was the Hadean time and ended by the Proterozoic. The time range of this era was from 4.6 billion years to about 545 million years back.

Thus, the above given statement is false.

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

the titanic would be the correct answer