Intestinal bacteria are necessary for plant-eating animals to digest
A) cellulose.
B) lipids.
C) proteins.
D) carbon dioxide.
E) nitrogen.
A
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Materials like calcium, sulfur, iron, and many other minerals move within the plant
a. only via xylem. b. only via phloem. c. only in parenchyma. d. in parenchyma and phloem. e. in both xylem and phloem.
If many human genes differ in about 10% of their bases from another species' same genes and substitutions occur at an estimated rate of 2% per 1 million years, then about million years have passed since the two species diverged.
A. 20 B. 200,000 C. 3 D. 10 E. 5
Henry has the sickle-cell trait. Why might it be a bad idea for him to go on that hiking vacation that is being planned for the high Andes?
What will be an ideal response?
Immunoglobulin A (IgA) is mainly found
A. in the bloodstream B. in the spleen C. in the thymus D. on body mucous membranes E. on body skin