By appreciating the intricate clockwork of reef life, we gain a deeper respect for the world beneath the waves and the urgent need to protect it. The 24-hour clock of coral reefs is a testament to ...

However, you can tell the time without saying am and pm. To do this you can use the 24-hour clock. The 24-hour clock always uses 4 digits. You see this most often on digital clocks. Complete this ...