In sharks and rays, the skeleton is made of ________
Fill in the blank(s) with correct word
cartilage
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A group of AIDS patients and their families is exposed to the fungus Pneumocystis carinii. There is great concern among the individuals. You have been asked to address the situation. Explain what you would say to the group to give them a plausible treatment strategy.
A. Those with AIDS should not be concerned. This fungus is the cause of AIDS--they already have the fungus. B. Those with AIDS should be concerned as this fungus attacks T-cells in the same way as does AIDS and thereby increases the severity of the disease. C. Those with AIDS should not be concerned, as the fungus attacks the AIDS pathogen and thereby reduces the severity of the disease. D. Those with AIDS should be concerned as the fungus infects individuals whose immune system has been weakened by AIDS and causes pneumonia.
Instinct is another name for innate behavior. Indicate whether the statement is true or false
Craniates have skulls made of either bone or cartilage
Indicate whether the statement is true or false
You find the frozen remains of a woolly mammoth in an Alaskan glacier. You analyze a bit of the tusk and find that its 14C:12C ratio is about one-fourth (25%) of the baseline level typically found in living organisms. Given that the half-life of 14C is
5,730 years, when did the mammoth die? A) 5,730 years ago B) about 12,000 years ago C) at least 25,000 years ago D) about 75,000 years ago