Why do some seeds have to pass through an animal’s digestive tract in order to germinate?
a. The animal digests the seed coat.
b. There is a lack of oxygen.
c. There is a lack of sunlight.
d. The temperature is appropriate.
A
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Flowering plants such as prairie grasses, corn, and many common trees do not have showy petals. Explain how these plants are pollinated
What will be an ideal response?
The onset of puberty
A. is typically earlier in girls than boys. B. involves increased production of estrogen or testosterone. C. causes changes in body structure. D. All of the above are correct.
The photic zone in aquatic environments is typically about how deep?
A. 1000 m B. 10 m C. 500 m D. 100 m E. 50 m
The perforin-granzyme pathway involves
A) the production of fever, which kills the pathogen. B) the production of antibodies toward the invading pathogen. C) the production of special cell-killing proteins that act on infected or abnormal cells. D) presenting the foreign antigen to B cells. E) binding CD95L to infected cells, which eventually leads to cell apoptosis.