During the cenozoic era, this animal group greatly increased in number.
a. insects
c. mammals
b. reptiles
d. fish

The answer is “mammals” which is given at letter C. This is because many animals became extinct during this time, which helped the number of mammals increase. The word “Cenozoic” came from Greek words which mean “new life”. This is the era that we are in right now, and this started 66 million years ago. 

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the dominoes began to fall. the surrender at appomattox took place a week later on april 9. while it was the most significant surrender to take place during the civil war, gen. robert e. lee, the confederacy's most respected commander, surrendered only his army of northern virginia to union gen. ulysses s. grant

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