Provide definitions/explanations for the following terms:
$(1)$ Malpighian body
$(2)$ Sebaceous gland

(N/A) $(1)$ Malpighian body: It is a functional component of the nephron in the kidney. It is formed by the combination of the glomerulus and the Bowman's capsule.
$(2)$ Sebaceous gland: It is a typical exocrine gland present in the skin of mammals. It secretes a mixture of wax,sterols,fatty acids,and hydrocarbons,collectively known as sebum,which helps in keeping the skin moist and waterproof.