Which of the following is a true statement?

1 The first whales evolved during the Quarternary Period.

2 Falling sea levels and colliding continents created connections between continents that led to great movements of land animals during the Neogene Period.

3 Land mammals such as bats, cats, dogs, cattle and mammoths became common during the Neogene Period.

4 During the Quarternary Period, the Earth heated up