I cannot find this anywhere pls help asap Which is NOT part of the body's protection against disease?
Lymphocytes.
bone marrow.
the skin.
the lymph system
the heart.

Answer

The Heart.

Explanation

Bone marrow produces B lymphocytes.

Lymphocytes are a type of white blood cell involved in the production of antibodies (protein markers that can cause pathogens to cling together).

The skin has several layers which act as a barrier against the entry of pathogens.

The lymph system is a network of tissues and organs that consists of lymph vessels. It’s primary function is to transport lymph, a clear, colourless fluid containing white blood cells that helps rid the body of toxins.

Covalent bond is the correct answer