How does stomach acid assist the innate immune system?
a. The acid signals B cells to the site of infection.
b. The acid signals T cells to the site of infection.
c. The acid creates an inhospitable environment for pathogens to live.
d. The acid breaks down the food sources, and the pathogen starves.
c. The acid creates an inhospitable environment for pathogens to live.
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The waterproof cuticle covering the epidermis of land plants helps prevent dehydration, much like the skin of some land animals. As a consequence of having a cuticle, what other evolutionary adaptation was important for most land plants?
A. the endodermis in the root B. root hairs on the root epidermis C. collenchyma fibers just beneath the surface of the epidermis D. stomata in the leaves E. trichomes on leaf surfaces
Use the figure above for the following question(s)
10. The mass number of the atom depicted in the figure is
a. 5. b. 7. c. 8. d. 15. e. 22.
Which event occurs in body tissue blood?
a. In the plasma, HCO3- and H+ convert into CO2 and H2O. b. Erythrocyte HCO3- enters the plasma. c. Free H+ releases from hemoglobin. d. CO2 binds to hemoglobin.1124
Describe the environmental water cycle.
What will be an ideal response?