The folded structures in the stomach are known as rugae.
Answer:
A and D.
Explanation:
Sharks gills are located on the side of their bodies while on the other hand, Skates have gills that are located in underneath of their mouth. In sharks , large spiracles are present on the ventral sides of shark's head whereas in Rays or Skates, spiracles are large in size and located on the dorsal side of their head. Spiracles is an external respiratory opening, located behind the eye of a cartilaginous fish.
The frequency of allele T would decrease and the frequency of allele t would increase.
