D. Fish
The brain is part of an organism's central nervous system. Simpler organisms such as sponges, hydrae, and flatworms lack the complexity in their central nervous systems to have a brain. A fish, on the other hand, is complex enough to have a central brain.
Answer:
Ethoxy ethen. This compund is the functional group of ethar ( R-O-R )
Explanation:
Answer:
These are Kepler's Laws of Planetary Motion
Explanation:
It should be cell, neutron, atom, and electron. If not then I’m so sorry
