The Gulf Stream takes relatively cold water toward northwestern Europe
Indicate whether the statement is true or false.
ANS: F, warm
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Which of the following correctly describes the fate of the embryonic germ layers?
A. The endoderm forms the gut, the ectoderm forms the epidermis and parts of the nervous system, and the mesoderm forms muscles and most internal organs. B. The endoderm forms the gut, the ectoderm forms the reproductive tract and endocrine system, and the mesoderm forms muscles and most internal organs. C. The endoderm forms the inner part of all internal organs, the mesoderm forms the middle parts, and the ectoderm forms the outer coverings. D. The layers are sequential structures that all disappear during development, with the endoderm appearing first and then is replaced by the mesoderm, which in turn is supplanted by the ectoderm. E. The endoderm is an embryonic structure that disappears early, whereas the ectoderm persists as the skin and the mesoderm as the internal organs.
The mechanisms that control the number of crossover events in a cell have been well characterized
Indicate whether the statement is true or false.
Four of the five answers correctly describe trends in plant evolution. Select the exception
a. nonvascular to vascular b. sporophyte dominant to gametophyte dominant c. motile to nonmotile gametes d. seedless to seeds e. haploid to diploid dominance
Paired homologous chromosomes are found at the spindle equator during ____
a. metaphase I b. telophase I c. prophase II d. metaphase II e. anaphase II