The mitochondria is the powerhouse of the cell. on a serious note, The most prominent roles of mitochondria are to produce the energy currency of the cell through respiration, and to regulate cellular metabolism
Stratum corneum is the answer
thin walls.
a moist inner surface.
a huge combined surface area.
This statement giving a clue that there is asexually reproduction (may be binary fission) taking place and the progenies in asexual reproduction are genetically similar to parent cell. So answer is A.
Yes, the pterosaurs is the ancestor of the bird.