Which of the following galaxy types is usually made of mostly older stars

The unique structure of the neuron is dedicated to the efficient and rapid transmission of neural signals. the relationship between neurons, the spinal cord, and the brain constitutes an elaborate communication system throughout the human body. all but one of the functions listed below are a result of this interaction.

Me with biology endocrine system crossword also image left i need with hw

What could happen if two base pairs on a strand of dna or switched