Are birds more like humans or kangaroo rats in the challenges they face in deserts and the way they cope with these challenges?
What will be an ideal response?
Birds, like humans, are diurnal animals so they are exposed to daytime heat, whereas most rodents are nocturnal, avoiding the highest temperatures by remaining in their burrows during the day and emerging only at night when the desert has cooled. And birds are like humans in being mobile and able to move several kilometers to find food or water, whereas the movements of desert rodents are limited to several tens of meters.
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Children in northern regions experience months of inadequate sunlight exposure on the skin. To prevent possible abnormal bone development, what essential organic nutrient is necessary in the diet?
A) vitamin C B) calcium C) cholecalciferol D) protein E) retinol-A
The genetic material of the cell, DNA, is bundled into "packages" of chromatin, known as chromosomes.
Answer the following statement true (T) or false (F)
A cell is placed in a hypotonic solution. The cell will
a. lose water by diffusion b. gain water by osmosis c. lose water by exocytosis d. gain water by pinocytosis e. remain unchanged
Which condition is associated with neurofibrillary tangles and progressive memory loss?
A. Tic douloureux B. Meningitis C. Parkinson disease D. Alzheimer disease E. Glioma