Which of the following is FALSE:
-Many people with total blindness experience life-long sleeping problems because their retinas are unable to detect light.
-These people have a kind of permanent jet lag and periodic insomnia because their circadian rhythms follow their innate cycle rather than a 24-hour one.
-Daily supplements of melatonin may improve night-time sleep for such patients. -Blind people cannot sense light and are therefore unable to modify their sleep/wake cycle.
-Blind people cannot sense light and are therefore unable to modify their sleep/wake cycle.
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Carbon dioxide is an element
Indicate whether the statement is true or false.
Carbonaceous chondrites have been heated to high temperature at least once since they formed
a. True b. False Indicate whether the statement is true or false
Why is it so difficult for scientists to know how many species have already been described?
A) Scientific journals do not publish accounts of new species. B) There isn't one location for cataloguing all species. C) Scientists are too busy testing hypotheses to investigate the number of species on Earth. D) Many species are microscopic, so they are difficult to study.
Artifcatual precipitate seen in the Grocott stain may be the result of using:
a) plastic forceps b) gelatin in the water bath c) glassware that was not chemically clean d) excess time in the gold chloride solution