In the figure above, this group of plants was given treatment V
a. 1
b. 2
c. 3
d. 4
e. 5
B
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In the earliest karyotypes, chromosomes were distinguished by
A) specific size order. B) general size classes. C) banding patterns. D) stage of the cell cycle.
Which of the following statements is true about scientific theories?
1.A theory is a related set of hypotheses that form a broad-ranging explanation of many phenomena. 2.Theories can not be rejected. 3.Once established, theories can not change. 4.Scientists must not change their minds and replace theories in light of new evidence.
The installation of tile drainage systems on farms removes wetlands from the Midwestern landscape. This with the loss of coastal marshes in the South are dramatically impacting
A) migratory waterfowl. B) blue crabs. C) salmon. D) crayfish.
The following sequence represents events in the development of a fruit
A. pollination; fertilization; embryo; ovary matures. B. pollination; fertilization; germination of pollen; ovule matures; embryo forms. C. pollination; endosperm; embryo; ovule matures. D. pollination; double fertilization; ovule matures; embryo forms; ovary matures. E. pollination; germination of pollen; endosperm; ovule.