B. Digestive and Circulatory
P goes with true breeding parents. The other two descriptions aren't quite right. F1 refers to the offspring of P. F2 refers to the offspring of F1. The descriptions are already in the correct order.
Answer:
Explanation:
Science (genetics, molecular biology, genomics) genes or gene products that are homologous (descended from a common ancestor) and are found in separate species due only to the speciation event (not to gene duplication).
Answer: Dopamine
Explanation:
It is made in the brain and also can be used as messengers particularly chemical messengers to relay message between nerve cells. It also help in how we feel pleasure and also assist us with that special ability to think first and then plan.
The answer is option a hope it helps