Dead cells called keratinocytes make up the hair which contains mtDNA and not nuclear DNA.

Which process is involved in growing crops? irrigation transportation recreation condensation

When analyzing tree rings, what do scientists assume a thin ring indicates?

Which phrase is the best summary of the model shown? a. the transfer of the sun's energy through trophic levels b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the breakdown of food molecules