Which is not a characteristic of the gymnosperms?
A) Cones
B) Seeds
C) Pollen
D) Flowers
D
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Multiple Excitatory Postsynaptic Potentials (EPSPs) from temporal summation and spatial summation can result in:
A. an action potential. B. filtering out of unimportant background signals. C. adaptation. D. hyperpolarization.
The short appendages on some pathogenic bacteria that provides adhesion to host cells are called
What will be an ideal response?
There is strong evidence that two species of cliff-dwelling birds have nested in the same environment and fed in the same water for thousands of years, with each having stable population sizes. Based on this information, which of the following statements is the best conclusion?(A) One species is a better diver than the other species is. (B) The two birds compete for food. (C) One species will displace the other. (D) The two birds have different ecological niches that allow coexistence.
(A) One species is a better diver than the other species is. (B) The two birds compete for food. (C) One species will displace the other. (D) The two birds have different ecological niches that allow coexistence.
Why must water that has moved to the interstitial fluid in the medulla be quickly removed from the interstitial fluid?
A) to prevent dilution of urine B) to prevent destruction of the concentration gradient necessary for water reabsorption C) to equilibrate the concentration of solutes in the cortex and medulla D) to maintain an environment for transport of nutrients