2nd one is the right answer
I think can be water, light, temperature, nutrients
Hope help!
The aortic valve prevents backward flow of blood into the left ventricle.
Ayahuasca, DMT, LSD, mescaline, psilocybin, DXM, Ketamine , PCP, salvia.
I am so sorry you have waited this long for an answer! The most common cloud type produced by warm fronts are stratus clouds.
I am not a professional, simply using prior knowledge!