Did Darwin develop his theory of evolution through experimentation or observation or other methods?
A. Experimentation.
B. Observation.
C. Both experimentation and observation because he collected samples but also worked experimentally with finches.
D. Mathematical analysis of experimental data.
B. Observation.
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What is one reason why women with the genotype XXX are not phenotypically different from an XX female?
A. Because only one X is active in each cell, regardless of how many X chromosomes there are in a cell. B. Because the X chromosome only carries genes dealing with being a female, so having another one doesn't matter. C. Because the extra X chromosome only becomes active in nonreproductive areas of the body. D. Because we have enzymes that will recognize and degrade the extra X chromosome. E. None of the answer options is correct.
The waxy substance on leaf surfaces is the:
A. cuticle. B. stomata. C. epidermis. D. leaf hair. E. mesophyll.
Identical gene loci are located on ____________________
Fill in the blank(s) with correct word
In an annual tree ring, the light wood is
a. produced each spring. b. the remnant of the bark produced the year before. c. formed from crushed phloem cells. d. produced in the winter. e. composed of small-diameter, thick-walled cells.