What component of muscle is described as a bundle of actin, mysoin, and other protien filaments

Which could be a pathway of food through an ecosystem

The graph shows the area of forest cover in various regions of the world through a forest station forest habitats have been established in areas that previously didn't have forest and with geographic region has this approach been most successful

Some cells release substances that can travel to other cells in the body and be detected by checkpoint proteins. this signals that the cell should divide. these substances are called checkpoint stimulators cell cycle enhancers targeted molecules growth factors