In the human body, keratin is a protein which is essential for healthy hair and nail growth. if a patient went to the doctor concerned with brittle hair and fingernails, which essential element would the patient most likely be lacking?

Biotin or vitamin B7

Explanation:

Biotin or Vitamin B7 is a crucial in keeping the nails and hair healthy. This element helps in the strengthening the weak and brittle nails and hair.

As we known the nails and hair are made of protein, L-lysine supplements cab be taken to keep the hair and nails healthy.

The diet of the person should be rich in protein and vitamin B7. So, a person who is having poor nails must have a diet rich in proteins.

answer; a male inherits only one allele of the x-linked gene controlling hair color;

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.