The carbon that plants need for photosynthesis comes from carbon dioxide, or CO2 that's present in our atmosphere. Hope it helps
If a patient develops a myocardian infraction that disables the sinoartial node, the heart would still pump blood to the aorta and the pulmonary trunk regardless, because the atrioventricular node will still stimulate the ventricular systole.
Life was different for early humans than humans in this time because back then they didn’t have the same technology we have now, and knowledge about science and evolution of medicine.
The answer is a smoke curtain.
It is a dense, vertical development of smoke. It is positioned between friendly
and enemy positions to avert or damage enemy ground observation of friendly
positions. Since the smoke curtain is not placed directly on friendly troops,
it will not hinder friendly operations. Also, it activates in the event
of a fire, on condition that a means of diverting smoke away from a preferred
location or protecting an area from direct smoke infiltration.
