Normal pattern of tooth eruption.. The crown and root together in opposite way

Normal pattern of tooth eruption:

• A. The crown before the root.
• B. The crown and root together in opposite way.
• C. The crown and root in the same way.
• D. the root before crown.

The normal pattern of tooth eruption is for the crown to emerge first, followed by the root. So the answer is A. 

Here's a breakdown of the tooth eruption process:

- Development:

The tooth starts to develop within the jawbone before birth.

- Root formation:

The root of the tooth begins to grow first.

- Crown eruption:

Once the root is partially formed, the crown (the part of the tooth you see in your mouth) starts to push through the gum tissue.

- Continued root growth:

As the crown erupts, the root continues to grow until it reaches its full length.