Platelets are pieces of cytoplasm and cell membrane derived from ________
Fill in the blank(s) with correct word
megakaryocytes
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The vegetative parts of plants are the
A. flowers and fruits only. B. stems, roots, flowers, leaves, and fruits. C. roots, stems, and leaves. D. roots, flowers, and stems. E. fruits, flowers, and leaves.
Compared to viewing a distant object, a human viewing an object held within five centimeters of the eye requires a lens that _____
A) has been flattened, as a result of contraction of the ciliary muscles B) has been made more spherical, as a result of contraction of the ciliary muscles C) has been flattened, as a result of relaxation of the ciliary muscles D) has been made more spherical, as a result of relaxation of the ciliary muscles E) does not change its shape
What disease increased dramatically during the 1997-1998 El Nino/Southern Oscillation?
a. cholera b. diphtheria c. AIDS d. polio e. measles
In the simplified prairie food chain illustrated in the pictures below, the letter D represents ____
a. tertiary consumer b. secondary consumers c. first trophic level d. primary consumers e. third trophic level