ASVAB General Science Practice Test 835086

Questions 5
Topics Geologic Time Scale, Periods, Producers, Species, Stomach

Study Guide

Geologic Time Scale

The Earth is approximately 4.6 billion years old and its history is divided into time periods based on the events that took place and the forms of life that were dominant during those periods. The largest graduation of time is the eon and each eon is subdivided into eras, eras into periods, periods into epochs, and epochs into ages.

Periods

The rows of the Periodic Table are called periods and contain elements that have the same number of electron shells ordered from lower to higher atomic number.

Producers

Producers (autotrophs) serve as a food source for other organisms. Typical producers are plants that can make their own food through photosynthesis and certain bacteria that are capable of converting inorganic substances into food through chemosynthesis

Species

The narrowest classification of life, species, contains organisms that are so similar that they can only reproduce with others of the same species.

Stomach

Food is mixed with gastric acid and pepsin in the stomach to help break down protein.