Which of the following is NOT a result of global warming?
A) changes in the breeding seasons of some species
B) increased forest clearing for agricultural purposes
C) melting permafrost
D) shifts in the ranges of some species
B
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The specific abiotic factors defining a biome are _____
I) annual variation in temperature and precipitation II) average annual temperature and moisture levels III) maximum annual temperature and moisture levels IV) maximum annual temperatures, moisture levels, and average annual temperature A) only I and II B) only III and IV C) only I, II, and IV D) only II, III, and IV E) only I, II, and III
Salt is often used to melt ice on roads during the winter because it lowers the freezing/melting point of water. When salt dissolves in water, individual Na+ and Cl- ions break away from the salt lattice and become surrounded by water molecules. Why would this cause ice to melt?
A. Hydrogen bonds are broken, and the salt ions interfere with interactions between H and O. As a result, it is more difficult for water molecules to bond and form ice. B. Hydrogen bonds are formed, and the salt ions bond with O. As a result, it is more difficulty for water molecules to bond and form ice. C. Hydrogen bonds are broken, and the salt ions bond with O and H respectively. As a result, it is more difficult for water molecules to bond and form ice.
Identify the point in time during an action potential when a positive feedback process is occurring in a neuron.
A. when the neuron is at rest B. as the neuron is being depolarized and passes the threshold potential C. after the peak depolarization of the action potential when it is rapidly repolarizing D. during the undershoot phase when the neuron is slightly hyperpolarized relative to the resting potential E. A positive feedback process is occurring at all the time points given.
A fish circulatory system is indicated by
a. A. b. B. c. C. d. both A and B. e. none of these