________ have been defined as communities of organisms and their physical and chemical environments that function as self-regulating units.
Fill in the blank(s) with the appropriate word(s).
Ecosystems
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Most cells have a negative plasma membrane potential (Vm) because they have
A) equal concentrations of ions on both sides of the membrane. B) an excess of negatively charged solute molecules inside the cell. C) an excess of positively charged solute molecules inside the cell. D) an excess of negatively charged solute molecules outside the cell. E) an excess of water molecules inside the cell.
Which of the following is the most probable sequence of events when fertilizer runoff reaches a bay?
What will be an ideal response?
Which one of the following STDs is NOT caused by a virus?
A) AIDS B) chlamydia C) genital warts D) genital herpes
What is the purpose of the functional photoreceptors in mole rats, even though the image-forming part of the brain is dramatically reduced?
a. It allows them to set their biological clock properly, which is necessary for reproduction. b. It allows them to hunt successfully. c. It allows them to see other individuals in their group properly. d. It allows them to set their biological clock