What is the characteristic feature of consumers?
A. Autotroph
B. Heterotroph
C. Parasite
D. Saprophyte
Scurvy and beri – beri and caused by the deficiency of___________?
A. Vitamin b and c
B. Vitamin b and d
C. Vitamin c and b
D. Vitamin a and b
The first eukarotes appeared about __________ years ago?
A. 1.5 billion
B. 2.5 billion
C. 3.5 billion
D. 4.5 billion