The biotic factors of the North American ecosystem that influence lodgepole pine populations are A.
fire, pine beetles and fungus

B.
clear cutting by lumber companies and -25 oC winter temperatures

C.
the mountain pine beetle parasite and fungus

D.
warm dry summers and cold wet winters

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

Draw the structure of dna nucleotide with adenine as nitrogenous base

Under the soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources. select the best answer from the choices provided a b c d