Which of the following is not a natural source of light?
a. oil lamps
b. the sun
c. phosphorescence
d. fluorescence

Find and describe the climate zone in which you live,where else in the world do you find this climate zone? do you have any ideas about why the climates might be similar?

Which ideas did your answer contain? check all that apply. no food for organisms no oxygen in the atmosphere no trees or flowering plants no products based on trees or plants (building materials, medicines, fuels, fibers) no fossil fuels

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?