The correct answer is "neurons".
Neurons are nerve cells which connect to each other using synapses and form neural networks. They exhibit high levels of specialization and are the primary components of the central nervous system.
Myofibrils are contractile fibers which form the striated muscle cells. Sarcomeres are the structural unit of the myofibrils.
1. less solar energy
2. everything would be flipped, for example summer would be cold and winter would be warm.
One reason would be the increased chance of Down syndrome