I think it is d because the other places are of course wet lands.
Molecules that are hydrophilic (water loving) are capable of forming bonds with water and other hydrophilic molecules. They are called polar molecules. ... Small, nonpolar molecules (ex: oxygen and carbon dioxide) can pass through the lipid bilayer and do so by squeezing through the phospholipid bilayers.
Venus is often called the sister planet of Earth because of its size, mass, and what its material its made of.
If it has valves then it is a vein.
I think the answer is naturally acquired active immunity..also depends on which disease
