Considered to be homologous structured similarities, they are different due to evolution and how they were used over thousands of years, eventhough they are all similar because of a common ancestor.
In matrix of the mitochondria, in a eukaryotic cell. So, your answer ia A.
When ripe pollen from anther of the same kind of flower catches on the stigma, each pollen grain sends out a tiny thread like tube. The tube grows down through the style and pierces one of the ovules in the ovary.
I believe the answer is: The digestive system. The digestive system is the pathway mostly responsible for breaking down the food and liquids we intake. The materials we ingest are processed through different organs and are slowly absorbed by the body through the process of digestion. Other supporting organs that contribute to this are the liver and the kidneys.
Hope this helped :)