Answer:
D
Explanation:
People ar lonely in space!
Prime numbers are numbers that are only divisible by 1 and themselves. So, to tell if a number is prime, look at its factors.
19:
1 x 19
29:
1 x 29
39:
1 x 39
3 x 13
So, because 39 has more than one set of factors, it's NOT a prime number.
Answer:
The earliest stone tool making developed by at least 2.6 million years ago. The Early Stone Age began with the most basic stone implements made by early humans. By 200,000 years ago, the pace of innovation in stone technology began to accelerate. Middle Stone Age tool kits included points, which could be hafted on to shafts to make spears. During the Later Stone Age, the pace of innovations rose. People experimented with diverse raw materials the level of craftsmanship increased, and different groups sought their own distinct cultural identity and adopted their own ways of making things.
Explanation:
Most societies have adopted the <span>Gregorian </span>calendar for civil affairs.
If one has a knowledge in regard to the brain as well as the memory systems in helping individuals from suffering memory problems like poor memory,PTSD and amnesia it will surely be of big help in understanding such conditions and to know how to deal with them.
