It means a continental drift occurred
The Moon appears to Earth as a small crescent, as it rotates around the Earth this expands to a full moon and back to a small crescent. This happens once every 29 days and is called a lunar month. The Moon causes the rise and fall of the ocean's tides on Earth.
A chromosome contains one long DNA strand.
B.
Tall parents can have a short child, short parents can have a tall child , and two parents of the same height may have a child in between?