What isotope pair used to determine the age of fossils

Carbon 14 and Potassium -40

Explanation:

Radioactive isotope of carbon -14 is used in carbon dating. The half-life of C-14 isotope is 5730 years. It is an efficient isotope which can be used to determine the age of fossil which are younger than 75 thousand year old. Isotopes of other element are also used for dating such as Potassium -40 (half life = 1.25 billion years).

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation:

the correct answer in apex is tissue development, i know because i just had this question