nitrogen cycle
What will be an ideal response?
Nitrogen enters the living world from the atmosphere through nitrogen-fixing bacteria. This nitrogen and nitrogenous waste from animals is then processed back into gaseous nitrogen by soil bacteria, which also supply terrestrial food webs with the organic nitrogen they need.
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This element is prominent in both living organisms and in the Earth's surface
a. carbon b. hydrogen c. silicon d. aluminum e. oxygen
The production of pollen, seeds, and flowers attributed to the widespread distribution of angiosperms. Why is the production of seeds an advantage?
A. It allows fertilization in the absence of water. B. It protects and nourishes the embryo. C. It promotes pollination. D. It allows fertilization in moist areas. E. It is necessary for sexual reproduction.
DNA seen in nucleus and
a. lysosomes b. golgi bodies c. mitochondria
A superinfection results from
A) An immune system reaction to the drug. B) Decrease in most normal flora with overgrowth of an unaffected species. C) All of these choices are correct D) The wrong drug administered to the patient. E) Build up of a drug to toxic levels in the patient.