because it is a new virus that us humans have not experienced and we are still learning about it
The southern hemisphere would be experiencing winter :)
Hey! here is your answer
passive refilling of the heart occurs During ventricular systole, the blood pressure
They are sandwiched between two layers of heads. Recall that the heads are hydrophilic therefore they will always be on the outside and the tails are hydrophobi therefore they willl always be away from water, there fore sandwiched. I'm a bio major, hope I helped :)
