A. Biosphere B. Ecosystem C. Population D. Species
A. Three Kingdoms B. Five Kingdoms C. Two Kingdoms D. Six Kingdoms
A. simple B. advance C. complex D. highly complex
A. helper-T B. B C. both T and B D. none of these
A. carbon, oxygen, nitrogen, sulfur B. carbon, oxygen, hydrogen, nitrogen C. carbon, oxygen, sulfur, phosphorus D. carbon, sulfur, hydrogen, magnesium
A. Vitamin A B. Vitamin C C. Vitamin D D. B complex
A. Chloroplast B. A Nerve Cell C. DNA D. Hydrogen
A. Latin B. English C. Greek D. French