Think about the following examples of homeostatic regulation: in response to an increase in plasma k⁺ concentrations, the hormone aldosterone brings k⁺ levels back to normal. in response to a decrease in plasma ca²⁺ concentrations, parathyroid hormone brings ca²⁺ levels back to normal. which of the statements below is true?
a. both are examples of negative feedback regulation.
b. the second example illustrates positive feedback because the regulated variable (plasma ca²⁺) increases.
c. only the first example demonstrates negative feedback because the regulated variable (plasma k⁺) is lowered as a result.
d. both examples demonstrate positive feedback, because the alteration in the regulated variable results in an increase in secretion of the regulating hormone.

The tasmanian devil, a marsupial carnivore, is facing extinction due to devil facial tumor disease (dftd) which causes bulging cancerous lumps and lesions to erupt around the face and neck — often causing enough deformation to make seeing or eating difficult. dftd has evolved into a contagious cancer, a trait that is unique among cancers. devil mating behavior involves biting around the head and neck, allowing cells from one individual — especially cells from the crumbly dftd tumors — to be transferred to the wounds or face of a new individual. this marsupial was once found across australia, but sea levels rose, isolating the tasmanian population, while the australian population went extinct. what would be an outcome of genetic isolation that is likely to have impacted the spread of dftd? a) reduced territory puts diseased individuals in greater contact with non-diseased ones. b) inbreeding results in less variation in facial features so the cancer is generally fatal. c) genetic isolation has made it difficult for scientists to develop a vaccine against dftd. d) the lack of genetic variation in the immune system of tasmanian devils minimizes resistance to the disease.

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?

Your two friends just told you what to order for them at the drive through fast food restaurant. you give the order but when the food comes about 10 minutes later, you don't remember what each of your friends ordered your memory of the order was in __ memory. a. semantic b. flashbulb c. long-term d. short-term i think i know but i'm not really sure