In the natural carbon cycle, carbon dioxide is returned to the atmosphere by the respiration of animals and chemoorganotrophic microorganisms
Indicate whether the statement is true or false.
Answer: TRUE
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In mark-recapture, if number of individuals marked in first catch = 10, number of marked recaptures in second catch = 4, and total number of second catch = 8, what is the total population size?
A. 22 B. 24 C. 42 D. 20 E. 40
Answer the following statements true (T) or false (F)
1. Animals that do not control internal water concentration also typically do not control the concentrations of ions like sodium and potassium. 2. An animal that exhibits broad tolerance for changes in the salinity of its environment is said to be "euryhaline." 3. The materials in urine are ONLY those that are filtered from the blood or hemolymph and not reabsorbed by the body following filtration. 4. The filtrate that leaves the proximal convoluted tubule is much more concentrated than the blood in humans. 5. The blood supply to the loop of Henle also exhibits a countercurrent arrangement.
If an axon is wrapped with glial cells, nerve impulses are propagated down this axon
a. as the action potential travels steadily down the membrane of the axon. b. along the membranes of the surface regions of the glial cells. c. more slowly than they would be on or via an unwrapped axon, allowing for greater control over transmission. d. from one interruption in the myelin sheath to the next. e. in two directions from the middle of an axon.
Four of the five answers listed below are useful
to flowers as means of attracting vectors. Select the EXCEPTION.
a. nectar b. flower color c. color patterns d. pollen e. wind