Without the ____________ that photosynthesis produces, aerobic cellular respiration could not occur.
Fill in the blank(s) with the appropriate word(s).
Answer: oxygen
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A member of subphylum Hexapoda is a crab
____________________ Indicate whether the statement is true or false.
Each of the following is a characteristic of hormones except
A) synthesis by endocrine tissue cells. B) secretion directly into the bloodstream. C) having a hormone-specific lifespan in the blood ranging from seconds to hours. D) interacting with specific receptors on cells in target tissues throughout the body. E) All are characteristics of endocrine hormones.
Which protists produce much of the Earth's oxygen?
A. amoeba B. slime molds C. algae D. protozoa E. radiolarians
What happened in 1973 when Gibbs, Young and Smith injected CCK into hungry rats? What hypothesis did it lead to?
What will be an ideal response?