Use protection and be safe as much as possible.
Answer:
If semen gets in the vagina, the sperm cells can swim up through the cervix and uterus and into the fallopian tubes, looking for an egg. They have up to 6 days to find an egg before they die. When a sperm cell joins with an egg, it's called fertilization. Fertilization doesn't happen right away.
Explanation:
This is how reproduction works.
Answer:
There are three types or classes of levers, according to where the load and effort are located with respect to the fulcrum. Since humans usually provide energy to levers, "effort" and "load" are often used instead of input and output.
Class 1 has the fulcrum placed between the effort and load. Class 2 has the load between the effort and the fulcrum. Class 3 has the effort between the load and the fulcrum.
Each has its own uses and advantages.
Questions you may have include:
What is a class 1 lever?
What is a class 2 lever?
What is a class 3 lever?
This lesson will answer those questions. Useful tool: Units Conversion
Class 1 lever
A Class 1 lever has the fulcrum placed between the effort and load. The movement of the load is in the opposite direction of the movement of the effort. This is the most common lever configuration.
Explanation:
The war was started by the leaders of Germany and Austria-Hungary, Vienna seized the opportunity presented by the assination of the archduke to attempt to destroy its Balkan rival Serbia. This was done in the full knowledge that Serbia's protector Russia was unlikely to stand by and thus may lead to general European war. However, the largest share of responsibility lies with the German government. Germany's rulers made it possible by urging Austra-Hungary to invade Serbia. They also violated international treaties by invading Luxemburg and Belgium knowing that the latter violation was virtually certain to bring in Britain.
