what do this mean do you want free points
Answer:
Food webs and food chains.
A food web describes the flow of energy and nutrients through an ecosystem, while a food chain is a linear path through a food web
The electrical impulse travels across the axon, and the myelin sheath helps to increase transmission speed.
<span>A. The nebula contracts and shrinks instead of expanding
</span><span>Nebula is the cloud of interstellar dust and gas that forms a star. It is collborately shaped during colliding and collapsing of the interstellar mediums this is influenced by the gravitational attraction of the atoms and particles in the entites. Hence, there are three types of nebular namely, are classical nebula, diffuse nebula, planetary nebular and supernova remnants.</span>
