Low-grade fever is an effective defense for short periods of time because it increases iron in the blood. includes pyrogens that destroy the pathogens. increases temperature, which slows the growth of bacteria. slows the attack of phagocytes. forces the person to stay in bed. 1 points

I'm not to sure about this. Lemme see if I got this right hear me out.

I think increases temp and slows bacteria growth, non phagocyte cell that attack harder when temp rises therefore a quick low-grade fever will be more affected then a long term

oxygen +1 most likely

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.