The branch of biology which deals with the study of social behavior and communal life of human beings living in any environment is called ?

A. Environmental biology
B. Social biology
C. Human biology
D. Both b and c

__________ is essential for the formation of hemoglobin.

A. Calcium
B. Iron
C. Water
D. Carbohydrates

___________ are needed as a source of energy for the vital activities of the body?

A. Calcium
B. Iron
C. Water
D. Carbohydrates

Oxygen accounts for ____ % of totals human body mass?

A. 65%
B. 18%
C. 10%
D. 3%

The atoms of different elements combine with each other through ionic or covalent bonding to produce compounds this stable form is called:

A. An organ
B. A molecule
C. Tissue
D. Both a and c

Which one of them is a micro-molecule?

A. Polysaccharide
B. Protein
C. Hemoglobin
D. Atp

A structure formed by groups of similar cells organized into loose sheets or bundles performing similar functions is called as:

A. An organ
B. An organism
C. A tissue
D. A cell

Haemodialysis means cleaning of____________?

A. Urine
B. Blood
C. Glomerular filterate
D. Coelomic fluid

In animals coordination is achieved by means of?

A. Nervous system
B. Endocrine system
C. Respiratory system
D. Both a and b

Production of sweat and sebum is related with ?

A. Skin
B. Liver
C. Lungs
D. Git