The answer is a because without them our veins would be dead
1. plants do not need and complex excretory organ because it creates a very small amount or nitrogenous waste.
There are kingdoms and the kingdoms represent different organisms.
The inside layer<span> is made of hydrophobic fatty acid ( water hater ), while the outer </span>layer<span> is made up of hydrophilic polar heads (water lover). </span>
