Oxpeckers have long been thought to have a mutualistic relationship with cattle in Zimbabwe, whereby the birds remove ticks from the backs of cattle, and the cattle benefit due to the removal of parasitic ticks
The observational experiments of Weeks (2000 ) in Zimbabwe demonstrated that the relationship between oxpeckers and cattle was not mutualistic, but in fact parasitic. What two oxpecker behaviors did Weeks observe?
Weeks observed a parasitic relationship, where oxpeckers create open wounds in the cattle's skin and feed on the blood from these wounds; additionally, the oxpeckers feed on the cattle's earwax.
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Four of the five answers listed below are human efforts to improve the carrying capacity of the earth
for humans. Select the exception. a. desertification b. recycling c. green revolution d. irrigation e. conservation
Do individuals change when natural selection occurs? Why or why not?
A. Yes. Acquired characteristics produce adaptations. B. Yes. Individuals change because the population does. C. No. Individuals do not change, but the population does. D. No. Individuals do not change because the population does not.
Answer the following questions true (T) or false (F)
1. A woman begins puberty with about 400,000 follicles. 2. Sperm are fully mature when they reach the epididymis. 3. There is an epididymis adjacent to each testis.
All of the following are dimorphic, true fungal pathogens exceptÂ
A. Paracoccidioides. B. Coccidioides. C. Candida. D. Histoplasma. E. Blastomyces.