Gradual variation, as in human skin color, is an example of what?

Which sentence is an example of a strong conclusion to an autobiography? a. i stayed after school three days in a row to practice onstage in the auditorium. b. i knew i would have to practice all week to memorize my dance for the recital. c. after the recital was over, i knew practicing was worth it, and i was looking forward to my next big challenge. d. on opening night, i danced in front of a packed auditorium.

Draw the structure of dna nucleotide with adenine as nitrogenous base

What are the pros and cons of quadrat sampling?