What does the presence of the Widmanstätten patterns in iron meteorites tell us about their history?
What will be an ideal response?
The physical characteristics of meteorites provide evidence that they are fragments of parent bodies in the asteroid belt that were large enough to grow hot from radioactive decay or other processes. They then melted and differentiated to form iron-nickel cores and rocky mantles. The molten iron cores would have been well insulated by the thick rocky mantles, so that the iron would have cooled slowly enough to produce big crystals that result in Widmanstätten patterns.
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In experiments to test apical dominance, researchers found that:
A. if the shoot tip is cut off and auxin is applied, the axillary branch will grow. B. if the shoot tip is cut off and treated with a substance that inhibits auxin transport, the axillary branch will grow. C. if the shoot tip is cut off and cytokinins are applied, the axillary branch will grow. D. if the shoot tip is cut off and treated with something that inhibits cytokinin transport, the axillary branch will grow. E. branching is enhanced by the movement of auxin from the shoot tip toward the root.
Because of its association with tools, the earliest human was called ____________ meaning "handy man."
A. Homo habilis B. Homo erectus C. Homo sapiens D. Neanderthal E. Cro-Magnon
In most eumetazoans the innermost tissue layer during development is the
a. mesoderm. b. epiderm. c. mesoglea. d. endoderm. e. ectoderm.
Mycobacterium tuberculosis:
A. produces several virulence factor enzymes and an exotoxin. B. has a cord factor that can prevent destruction by lysosomes and macrophages. C. is a spore former. D. has a capsule. E. lives in the soil.