It's called an index fossil.
A gap in an area's geologic history is called an unconformity.
An Eon.
contact
Stratigraphic dating.
88 percent of geologic time is represented by the Precambrian time span.
The presence of urease indicates the presence of a specific bacteria called proteus. It's useful to identify the organism to determine the correct antibiotic to cure it.
A phenotype
A niche is the specific area where an organism inhabits.
Criteria
Criteria
specialization
Pheromones.
A gap in an area's geologic history is called an unconformity.
Any organism that eats another organism for food is called a heterotrophic animal. These organisms are also known as consumers.
Fish exhibit a specific type of ectothermy called Poikilothermy in which the environment in which the organism is in direct contact determines the organism's temperature.
Geologic Time. It's called the Geologic Time Scale.
Eras are subdivisions of larger units of geologic time called eons.