Historical themes help us study history by giving us an idea of what the time period or event being studied was about.
“A calendar was needed in the first place to track seasons. ... The progression of seasons ensured that there were 12 months in a year. Since the lunar cycle is shorter than 30 days, an extra month was added once every few years to keep calendars in sync with the seasons.” Need more explanation? Can you please mark me Brainliest?
Fox talbot - <span>Photographs
isaac singer - </span>Sewing machine
<span>Etienne Lenoir - <span>Gasoline engine
</span></span><span>Alfred Nobel - <span>Dynamite
</span></span><span>Wilhelm Roentgen - <span>X-rays</span></span>
Home video game systems first became very popular in the mid-1970s. The Atari 2600 was invented in 1977. This made video games very popular. They had games such as Pitfall, Pac-Man, and Demon Attack. The correct answer is B.
