In the Northern Hemisphere the reason that cold fronts are often
preceded by rain and cloudy weather
which quickly clears to reveal bright,
clear skies and sunshine, accompanied
by colder temperatures is primarily
due to the fact that-
A low pressure systems that push
cold air south often accumulate
unstable moisture in front of them.
B high pressure systems that push
cold air south often accumulate
unstable moisture in front of them.
C water cannot evaporate in very
cold air, so rain storms cannot
develop behind cold fronts.
D winds only blow on higher
temperature days.

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.

Which of the following can be reduced by the use of renewable energy sources? a. social costs b. economic costs c. environmental costs d. all of the above select the best answer from the choices provided a b c d

Drag each label to the correct location on the chart. match the function to the type of tissue