Answer:
The answer is option b. sacral bones.
Explanation:
The sacral bones are a shaped like a triangle and found below the fifth (5th) lumbar vertebrae and in between the hip bones. The joint formed with the hip bones is called the sacroiliac joint.
This shows that these animals ancestors were related to each other at one point in time
In 1980, the carbon oxide levels is 338.32 parts per millions,
while in 2000, the carbon dioxide levels is 369.67 parts per millions
So the increase is around
31.35 parts per millions
Im not sure sorry i hope u get the answer