Explain why the figure below suggests that extinction probability is independent of a taxon's age. Keep in mind that the y-axis is measured on a logarithmic scale
What will be an ideal response?
ANS:
The logarithmic plot suggests a straight line. This means that rate of extinction is the same regardless of how old a taxon is.
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What do scientists attribute to the remarkable survival abilities of the tardigrades?
a. like a virus, they are not truly alive b. the ability to mutate their DNA intentionally c. unique protective proteins that replace the water in their cells d. they are alien life visiting this planet
Characterize the pineal gland
What will be an ideal response?
A 57-year-old woman was admitted to a hospital with an infected toe, and the infection was spreading rapidly. The damage was being caused by an unknown microorganism that could not be cultured in the lab Doctors observed that antibiotics, which kill only prokaryotes, were ineffective. They suspected that the microbe was a fungus, so they tried the drug Amphotericin, which targets the ergosterols in fungal cells. Because animal cells contain cholesterols, not ergosterols, they are unaffected by the drug. Shortly after receiving Amphotericin, the patient improved, her infection ceased, and she was released from the hospital. In this scenario, what was the hypothesis?
A) Antibiotics will not kill the microbe because it is a fungal species. B) A microbe that has cholesterol is causing the infection. C) Why didn't the antibiotics kill the microbe that caused the infection? D) If the infection is caused by an animal, then Amphotericin will cure the patient. E) The infection will spread rapidly.
Which of the following is a disadvantage for animals living in groups?
A) Increased chance of being spotted by predators B) Reduced chance of finding a mate C) Decreased risk of disease D) Lower efficiency in finding food