Answer:
The return of blood to the heart is assisted by the action of the skeletal- muscle pump. As muscles move, they squeeze the veins running through them. Veins contain a series of one-way valves, and they are squeezed, blood is pushed through the valves, which then close to prevent backflow.
<span><span>A plant that, when self-fertilized, only produces offspring with the same traits.</span></span>
Invasive species is the easiest way to answer this, with invasive species the diversity will likely decrease
Because the moon is significantly smaller than earth,
Its gravitational pull is also smaller and weaker.
So he weighed much less on the moon than he did on earth because of the change in gravity
Its conducted by the conjugation of two mature cells
