Explain why certain teeth might appear first and certain teeth might appear last.

Teeth start developing in the unborn baby. Good nutrition from the mother during pregnancy is important in tooth development. The mother's diet should have adequate amounts of calcium, phosphorus, vitamin C, and vitamin D. Certain medicines (such as tetracycline) should not be taken during pregnancy. These can cause the unborn baby’s developing teeth to be discolored. There are 4 main stages of tooth development:

The first stage begins in the unborn baby at about 6 weeks of pregnancy (gestation). This is when the basic substance of the tooth forms.

Next, the hard tissue that surrounds the teeth is formed around 3 to 4 months of gestation.

After the child is born, the next stage occurs when the tooth actually sticks out (protrudes) through the gum.

Finally, the child loses the primary or baby teeth.

Explanation:

the higher the current the higher the mag field around it the higher the influence on the compass

compass can be used day and night, cloudy or sunny