Symmetry
... common shells found in the ocean or rivers. There are also flowers called "periwinkle" one species is European, another from Madagascar.
The most common gender in identical twins is both twins being female.
Fraternal twins are more popular.
Yes, it is common for twins to have two separate sacs in a pregnancy, known as dichorionic diamniotic twins.
The common noun in the sentence is flowers.
Tigris and Euphrates.
yes
Yes, horses can have twins, but it is not very common.
The are twins
Looks......?
ground fogs common near lakes and rivers because it is moist and cool there.
In the US, the incidence of fraternal (dyzygotic) twins is 32 in 1000 live births.