Biology students at science high spent the day swabbing surfaces throughout the school. they ran the swabs over a culture plate and then incubated the plates. 48 hours later, carol and jose checked their plate. ", do not open the cover of your culture plate! " warned their teacher. why did the teacher give this warning? a) the life form was unknown to the teacher and she did not want to expose the students to any dangers. b) spores from this potentially dangerous fungus would spread through the air and be inhaled by students. c) carol and jose's plate contains a streptococcus bacteria that could be potentially dangerous to humans. d) the culture revealed a potentially dangerous virus and if the culture plate was opened, the virus would spread rapidly.

Which of the following scenarios is an example of the bottleneck effect? answers a in south africa, much of the afrikaner population is descended from a small number of dutch colonists. in this population, this is an unusually high frequency of pseudoxanthoma elasticum (pxe), an elastic tissue disorder. b four white-tailed deer are introduced to a park in finland. thirty years after their introduction scientists compare the genes in the population and find that there is no variation. c during the industrial revolution, london's air became filled with soot. as a result, birds started eating more of the lighter moths because they were easier to spot than their darker counterparts. over time, the moth population changed so that there were more darker moths than lighter ones. d 10% of the population of american alligators in an area have the recessive trait albinism. a massive flood results in the death of 80% of the population. of the remaining population, 60% have the recessive trait of albinism.

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity