Which of the following includes all the others?
a. actin
b. myofibril
c. myosin
d. myofilament
e. muscle cell
E
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Approximately 3.5 million years ago the Isthmus of Panama formed. This new landmass severed the connection between the Pacific Ocean and the Caribbean Sea. An ancestral fish population (porkfish) was split in two by this event; the two populations no longer interbreed and are two distinct species. This type of speciation is called
A. allopatric speciation. B. parapatric speciation. C. hybridization. D. sympatric speciation. E. sexual selection due to ecological variation.
Temperature, salinity, and sediment composition are all examples of what?
a. Abiotic factors b. Environment c. Anaerobic factors d. Biotic factors
Even though the autumn may be unusually
warm, the leaves from deciduous trees begin to drop during September. Which of the following is the best explanation? a. The trees are responding to shorter days. b. The autumn months are usually drier because the summer rains have tapered off. c. The effects of phototropism are operating "right on schedule." d. There is not enough sunlight to carry on photosynthesis any longer. e. None of these are the best explanation
Long, cold, moist winters and short summers are typical of this biome dominated by gymnosperms
(A) deciduous forest (B) Tropical rain forest (C) Desert (D) Tundra (E) Taiga