These lines (there is four of them) are residuals of the fusion of the five sacrum vertebrae that are fused. These "vertebrae" or segments present a characteristics, being the first of them very similar to a lumbar vertebra, large, and the other vertebrae are<span> progressively smaller and flattened. They also present a curved shape being anteriorly concave.</span>
Answer:
1:2:1 is the genetic crosses
It is d) to continue the species!!
hope this helps :)
Answer: they can be either dominant or recessive
Explanation: due to the effects of one Gene are usually inherited in a simple mendelian pattern.
