Answer:
they have lower levels of the neurotransmitter serotonin
Letter B is the correct option
D.
The farmer will choose what traits are most desirable. Basically, its like an arranged marriage. If you are the animal, and your father is the farmer, your father is picking who you marry. So the farmer just chooses who mates with who.
Answer:
Cnidarians have groups of similar cells that work together as tissues, while sponges have no tissues, only disconnected regions of specialized cells.
