Question

The Cenozoic era is age of:
A. Fishes
B. Amphibians
C. Mammals
D. Reptiles

Answer 1

Hint: The geological history of the Earth is divided into four major time spans depending upon the variety of factors. These four divisions are known as Precambrian time, Paleozoic era, Mesozoic era and Cenzoic era. The Precambrian time is composed of 80% of the Earth’s history.

Complete Answer:
- The mammals belong to the class of vertebrates and have mammary glands for feeding their young ones.
- Other features of animals belonging to the class mammal are presence of hairs, warm-blooded in nature, presence of different types of teeth, respiration through lungs, four chambered heart, good hearing ability, well developed brain and some mammal species can lay eggs.
- The Age of Mammals is also commonly known as the Cenozoic era. The Cenozoic time period has a time span of 65 million years to the present. In this era, the Earth is dominated by large mammals as many other groups of animals become extinct.
- Along with this, the Earth was divided into continents of the present day. During the Cenozoic period, the drastic climate change took place over a short period of time and became cooler and drier than the Mesozoic era.
- The Cenozoic era is classified into three different periods such as the Paleogene, the Neogene and the Quaternary period based on their time spans.

Therefore, option (C) is the correct option.

Note: The term zoic means zoo, means animals. The term meso means middle and Paleo means ancient. The meaning of the term cen means recent. Remember that the Cenozoic era is the modern era. The evolution of all present species along with humans takes place during this era.