10. How do certain water beetles make and use underwater breathing devices?

¹⁰ UNDERWATER BREATHING. People strap tanks of air to their backs and remain under water for up to an hour. Certain water beetles do it more simply and stay under longer. They grab a bubble of air and submerge. The bubble serves as a lung. It takes carbon dioxide from the beetle and diffuses it into the water, and takes oxygen dissolved in the water for the beetle to use.

15. Animals conduct what various farming activities?

¹⁵ FARMING. For ages men have tilled the soil and tended livestock. But long before that, leaf-cutting ants were gardeners. For food they grew fungi in a compost they had made from leaves and their droppings. Some ants keep aphids as livestock, milk sugary honeydew from them and even build barns to shelter them. Harvester ants store seeds in underground granaries. (Proverbs 6:6-8)