The continent of origin for Homo habilis is believed to be ________.
Fill in the blank(s) with the appropriate word(s).
Africa
The continent of origin for Homo habilis is believed to be Africa.
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Plant behaviors are not always easily observed because they:
A. may occur at short intervals B. are mostly internal to the plant C. are mostly caused by internal organisms D. are not observable by the human eye E. are only observable with a microscope
Who demonstrated the crossover of homologous chromosomes in experiments on corn plants?
a. Frans Janssen and Curt Stern b. Thomas Hunt Morgan and Alfred Sturtevant c. Harriet Creighton and Barbara McClintock d. Walter Sutton and Theodor Boveri
Which of the following is an example of a positive feedback loop?
a. maintaining body temperature b. blood pH levels c. uterine contractions during childbirth d. blood glucose levels
. "Rapture of the deep" is caused by excessive
____ in the interstitial fluid. a. O2 b. H2O c. CO2 d. CO e. N2