I think the correct answer is necrotic tissue. Debridement is the removal of unhealthy tissue from a wound or skin to promote healing. It can be done using surgical methods, chemical, mechanical or autolytic (own body process)removal of the tissue. The unhealthy tissue may be a damaged, dead or infected tissue that is removed to improve the potential of healing of the remaining healthy tissue.
Answer: Its velocity was 20 km/s southward.
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The population changed the way it did because the mutation allowed the mutated animals to better survive in their environment compared to the normal species. Their size made them capable of getting food from higher branches that the normal species couldn't reach. THE ANSWER WAS ON GOOGLE
This statement is true. Early land animals indeed had gills as well as lungs. It is generally known that amphibians breathe through their skin, like how the lungs needed the skin for its respiratory. Fish have gills for breathing while mammals do have their nasal cavity and lungs for their gas exchange.