What is the main difference between muscle cells and nerve cells? a. they use different genetic codes. b. they have different ribosomes. c. they contain different genes. d. they express different genes.

The main difference between muscle cells and nerve cells is they express different genes.  

Explanation:

Muscle cell and neurons are both excitable in nature both in form and also in functions. The protein that helps in muscle specific genes, in the muscle cells which differs from neurons. The nerve cell uses protein to help and transmit the message. Muscle cells contract and shows excitability. Muscle cells send excitability messages through contraction. Nerve cells helps in the transmission of "neural synapses", muscle cells can be smooth. Smooth muscle cells help in make up the internal organs.

hi~~

i would say that hybridization occurs frequently in nature, because there are many types of hybrids that have occurred naturally, such as the mule (male donkey + female horse)

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.