What is the goal when using a dichotomous key?

A- to see changes in an organism

B-to analyze anchganism's DNA

C- to determine lifespan of organisms

D- to identify an organism

Alaska and northern canada have a diet rich in vitamin d and their skin color is darker than predicted on the basis of iv intensity at their latitude. explain the observation:

What is the relationship between absorbance of light and the rate of photosynthesis?

Name the types of burns one can get and which structures of the integument are damaged