In a recent experiment, anti-bacterial hand sanitizer was compared to two different anti-bacterial soaps. Students washed their hands using the products and warm
water for two minutes, and then dried their hands with a paper towel. The standard
of comparison was rubbing hands vigorously for 2 minutes in warm water, without
any soap or sanitizer, and then drying with a paper towel. The sanitizer
advertisement claimed to kill bacteria more effectively than any anti-bacterial soap.
After washing, hands were swabbed and then the swab applied to a culture plate and
incubated. Finally, the bacterial cultures were counted.
Based on the procedures and data, which of these is the MOST appropriate
conclusion?
The advertiser's claims are true; the hand sanitizer worked best.
The control situation was as effective as the hand sanitizer and anti-bacterial
soaps.
The experiment is not valid; there is no control.
Roth sans did a better igb killing bacteria than the hand sanitizer.

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.

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.

links? do you have a link? i don't see anything?