Which of the following is a product of photosynthesis? a. sunlight b. oxygen c. water d. carbon dioxide

Which type of neuroglia is found outside of the brain?

Which best explains why there are 64 possible codons in the genetic code and only 20 amino acids that make protiens of living organisms on earth

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation