Which scenario is an example of functional adaptation? a. a male bird let's out a mating call to attract a female birdb. poison dart frogs produce a roxic venmon that they can secrete out thier skinc. cobras elongate thier body when threatenedd. the color and shape of a flounder allow it to camouflage.

Spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Explain why it’s important for scientists to study the sun. list at least two challenges researchers face when examining earth’s nearest star.

You are studying several alleles of an e. coli helicase gene. one allele, called rsr, confers resistance to rs2014, an antibiotic that works by inhibiting helicase activity. bacteria with the rss allele are sensitive to rs2014. another allele, called ts-, produces a temperature sensitive mutation of the helicase. in bacteria with the ts- allele, helicase is inactivated at 42 °c but functions normally at 37 °c. helicase functions normally at both temperatures in bacteria with the ts allele. you obtain the following data while testing four strains of e. coli at different temperatures and doses of rs2014. each number represents the percentage of maximal dna synthesis. based on this data, assign the appropriate genotype to strains a–d in the spaces provided