Era is used to mark the boundaries of geological time scale by using radio carbon dating technique.
Explanation:
Geological time starts with Precambrian time.
Geologically, time is divided between the Precambrian era and present time into era.
The three eras are Paleozoic era, Triassic period and Cenozoic era.
Era is further divided into periods.
Scientists use radio carbon dating to study fossils and rock formation. With this study they were able to divide them in exact geological scale.
Geologic scale is the record of events in earth's history and evolution.
Explanation:
A prominent difference between active and passive immunity is that active immunity is developed due to the production of antibodies in one's own body, while passive immunity is developed by antibodies that are produced outside and then introduced into the body.
D. two atp are invested in the process of glycolysis
Answer:
H₂ + Cl₂ ---> 2 HCl
Explanation:
It looks like the reactants are not allowed to have coefficients (not enough boxes), so you need to pick reactants and products that satisfy this condition. The only ones that appear to fit are:
H₂ + Cl₂ ---> 2 HCl