The gift of science is electricity.
The post track is the oldest said to be made in 3838BC.
Answer: Within the next month you should start to feel fluttering sensations.
Explanation: Maternal perception of fetal movement usually begins 16 to 20 weeks after conception. The earliest reported perception of fetal movements is 7 weeks and the latest is 30 weeks with an average of 19 weeks. Fetal movement should be felt by 16 to 20 weeks. If movement is not felt by the end of that time, then further assessment is necessary.
I believe the answer is: Primary
For example, let's say take a look at normal employees at a company.
For most of them, the main reason they spend their time to do the job correctly is to obtain money/salary even though they have to spend their time being scolded by unlikable boss.
In the scenario above, we can say that money is the primary reinforcer for the target behavior
They are held together by electromagnetic force, and their nuclei are held together by the nuclear strong force.
