Diffusion is important to organisms because it is the process by which useful molecules enter the body cellsand waste products are removed. Digested food molecules (amino acids, glucose) move down a concentration gradient from the intestine to the blood.
We have just done this triangle so it may help you with the answer
Lordosis is considered as the abnormal curvature that forms at the lower and lumbar spine. An easy way to remember this, is that lord mean the equivalent of lumbar.
Cephalochordata is the subphylum that retains all chordate characteristics, even in the adult forms.
