What of the following describes how an organism responds to external stimuli? blinking occurs when dust hits the human eye the human body reduces sweating when its water levels are low a dog eats food when it is hungry a person yawns when oxygen is low in the lungs

2points what is the term for a female reproductive cell? a. egg b. chromatid c. allele d. fertilization

Dna has unique properties that allow it to accurately retain genetic information, even after multiple rounds of replication. one aspect of dna that allows it to accurately store genetic information is the base pairing from chargaff\'s first rule of the four nucleotide bases. if the c content of a dna molecule is 22%, what are the percentages of the remaining bases?

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.