It depends on what animal you are asking this question about. Some sea animals are born tail first so they can swim sooner and so they are not breathing in water. On the other hand humans are born head first so they can breath.
head first
Dolphins are born tail first because.......they might die before they got to the surface to breathe!! They are mammals like us, and do not have gills.
Head first.
(1,head,head),(1,head,tail),(1,tail,head),(1,tail,tail) (2,head,head), (2,head,tail),(2,tail,head),(2,tail,tail), (3,head,head), (3,head,tail),(3,tail,head),(3,tail,tail), (4,head,head), (4,head,tail),(4,tail,head),(4,tail,tail), (5,head,head), (5,head,tail),(5,tail,head),(5,tail,tail), (6,head,head), (6,head,tail),(6,tail,head),(6,tail,tail),
Thorny devils are hatched, not born. When first hatched, they are about 7 cm in total head to tail length.
With most mammals, head first presentation is ideal because the head is the largest part of the fetus, so it clears the way for the rest of the body(although in some animals, like cats, tail first is considered a variation of normal). In cetaceans however, it is different. If they are born head first, there is a higher risk of the baby inhaling water and thus drowning.
Vectors are added head to tail by placing the tail of the second vector at the head of the first vector. The resultant vector points from the tail of the first vector to the head of the second vector, forming a triangle. The length and direction of the resultant vector are determined by the magnitudes and directions of the original vectors.
The head-to-tail rule is a method used in vector addition where vectors are added tip-to-tail. This involves placing the tail of one vector to the head of the other vector in order to determine the resultant vector. The resultant vector is then the vector that connects the tail of the first vector to the head of the last vector in the series.
the head to tail rule
In addition of vector when vector A whose head is joined to the tail of the vector B and then the tail of the vector A is linked with the tail of the resultant vector and the head of the vector B is joined with the head of the resultant vector..... it means the addition of vectors are also defined the head to tail rule..
Calves are born in the water. Deliveries are usually tail-first, but head-first deliveries are also seen. The umbilical cord snaps during delivery.
When adding vectors using the head-to-tail method, you place the head of the second vector at the tail of the first vector. The resultant vector is drawn from the tail of the first vector to the head of the second vector. This technique preserves both magnitude and direction of the vectors being added.