False.
The semilunar valves are the pulmomic and aortic values.
the mitral and tricuspid valves prevent back flow of blood into the atria.
Answer:
by introducing an invasive species it can drastically change the ecosystem. let's say you have the manatee, it has no natural predators, if you add an invasive species that eats manatees it may cause other things to start eating them too. this would cause the population to dwindle until there are few to none left because the invasive species population will go unchecked because nothing is accustom to eating them
D. water its 100% right trust me I just checked it and it was right.
Answer: true
Explanation: Sleep is important to a number of brain functions, including how nerve cells (neurons) communicate with each other. In fact, your brain and body stay remarkably active while you sleep. Recent findings suggest that sleep plays a housekeeping role that removes toxins in your brain that build up while you are awake
hope this helps
plz mark brainliest
