Which is essential component of chlorophyll

Fill in the blanks- ________ is the essential macronutrient which is one of the component of chlorophyll.

Name the metal which is an essential component of haemoglobin.

Which is a component of chlorophyll ?

Transistor switch is an essential component of

Which are essential component of sleeping pills.

Which mineral element, besides nitrogen, is the component of chlorophyll?

Which one of the following pairs is the essential component of our food?

Nitrogen is an essential component of all-

State true or false: Carbohydrates is not an essential component of food.