An Italian scientist named Alessandro Volta invented the Voltaic pile in 1800. It was able to produce a steady electrical current. Based on this description, what is the modern equivalent of the Voltaic pile?
OPTIONS:
- a wire
- a battery
- a resistor
- a light bulb

a battery

Why is it winter in North America when it is summer in South America?
OPTIONS:
- The south is always warmer than the north.
- There is less land than water in the south.
- North America receives less direct sunlight during the winter.
- When it is December in North America, it is June in South America.

North America receives less direct sunlight during the winter.

The fossils that are found in the oldest layers of sedimentary rock were formed which types of organisms?
OPTIONS:
- only organisms that lived in the sea
- only organisms that lived on land
- only organisms that lived in the air
- organisms that lived on the land, in the sea and in the air
only organisms that lived in the sea