Which vitamin is available to the human body through sun bathing
(A) Vitamin A
(B) Vitamin D
(C) Vitamin K
(D) Vitamin B12
Very small time intervals are accurately measured by the___________
(A) Pabsars
(B) White dwarfs
(C) Atomic Clocks
(D) None of these
Chemically finger nails are made up of ____________
(A) Carbohydrate
(B) Fats
(C) protein
(D) Starch
Which of the following is responsible for largest amount of oxygen on earth
(A) Peat bogs
(B) Algae
(C) Trees
(D) None of these