What event marks the end of both the paleozoic era and mesozoic era?
a. the ice ageb. the appearance of birds
c. a mass extinction of plants and animalsd. the breakup of a supercontinent

D.The breakup of a super continent.

Explanation:

its not,

A.ice age.

B.The appearance of birds.

or

C.A mass extinction of plants and animals.

Thank you and your welcome.

answer; ///the correct answer is,by introducing a merit system of nobility.

answer: this is because archeologists keep finding artefacts and ancient ruins dated more than 10000 to 15000 years, date around scientists said humans discovered language; which is at least mysterious as scientists always have said that is necessary to have a language to have architecture and some basic maths.

explanation: brainlest