Arthritis always involves damage to the cartilages, but the specific cause can vary.

Why was the sample heated in step 5? describe the chemical principles involved in the reasoning behind this step?

Which best describes how the common cold spreads in the human body? a bacteria burst out of normal cells killing them b viruses replicate inside respiratory cells c bacteria inject dna into normal cells d viruses insert dna into bacteria

Which layer will become saturated first when rain falls?