The relationship between herbivore and the bacteria which live in their caecum is known as
A. Parasitism
B. Symbiosis
C. Commensalism
D. Saprophytism

2. Which of the following can be considered as a direct evidence of evolution?
A. Comparative embryology
B. Classification
C. Comparative anatomy
D. Fossil record
3. An organism which operates at cellular level of organisation carries out its physiological activities by using its
A. Cell membrane
B. Small size
C. Cytoplasm
D. Organelles
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