Where does the energy for a wave come from? A: the potential energy of height B:the kinetic energy of a push
C:the kinetic energy of a pull
D:the static energy not the molecules hitting

Wheres the rest of the answers to the question?

when charles darwin published  the origin of species  150  years ago he consciously avoided discussing the origin of life. however, analysis of some other texts written by darwin, and of the correspondence he exchanged with friends and colleagues demonstrates that he took for granted the possibility of a natural emergence of the first life forms. as shown by notes from the pages he excised from his private notebooks, as early as 1837 darwin was convinced that “the intimate relation of life with laws of chemical combination, & the universality of latter render spontaneous generation not improbable”. like many of his contemporaries, darwin rejected the idea that putrefaction of preexisting organic compounds could lead to the appearance of organisms. although he favored the possibility that life could appear by natural processes from simple inorganic compounds, his reluctance to discuss the issue resulted from his recognition that at the time it was possible to undertake the experimental study of the emergence of life.

keywords:   darwin, warm little pond, origin of life, spontaneous generation

Answer the air was stale and hot;

Let's start with heart: its role is to deliver oxygenated blood to other organs by blood arteries (generally colored in red), the diameter of these arteries decrease until it becomes capillaries, and there will be the exchange of the oxygenated and deoxygenated blood.the deoxygenated blood is transported back to the heart by blood veins (generally colored in blue), then the heart pump  this deoxygenated  blood to the lungs through the pulmonary  artery to re-oxygenate it then return back to the heart to be redistributed again.it should be noted that an artery  is a blood vessel which transport blood from the heart, and a blood vein transport blood to the heart (so artery is not always an oxygenated  blood, and veins is not always a deoxygenated blood).