Osteoblasts are most closely related to these cells A. Macrophages
B. osteocytes
C. osteoclasts
D. red blood cells
E. fibroblasts

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

What is the compliment dna strand to the following sequence: ttgactaggcta

The earth formed roughly 4.5 billion years ago, yet evidence of life dates back to about 3.5 billion years ago. which one is not a possible hypothesis of how life on earth arose?