The density of woody vegetation in a savanna is controlled through
A) mean annual temperature.
B) mean annual temperature, soil texture, and water-holding capacity.
C) mean annual precipitation.
D) mean annual precipitation, soil texture, and water-holding capacity.
D
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The best known chronic infection involves
A. chickenpox. B. herpes. C. hepatitis A. D. hepatitis B.
The selective agent is the environmental cause of fitness differences among organisms with different phenotypes
Indicate whether the statement is true or false
Which of the following animals does not use lungs to acquire oxygen?
A) whale B) frog C) bird D) butterfly
Zookeepers at the Chester Zoo in England reported that, without sexual reproduction, a Komodo dragon laid a clutch of eggs that hatched into healthy young. What evidence confirms this claim?
A. DNA testing confirmed that all of the DNA of the Komodo dragon babies was derived from their mother. B. All of the offspring were infertile. C. Asexual reproduction is common in lizards. D. All of the offspring were male.