The chromosomal structure that anchors the spindle fiber to the chromosome is known as the
____________________. Fill in the blank(s) with the appropriate word(s).
ANSWER: centromere
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Which of the following is an example of how natural selection is responsible for the variation seen in the human population?
A. Africans having a tall and skinny body to dissipate heat B. Inuits in Greenland having a stockier body shape to retain heat C. Africans carrying the sickle trait in areas where malaria is prevalent D. people in the northern regions having less pigmentation in order to obtain more vitamin D E. All the answer options are correct.
A sensory receptor is often a modified version of what type of cell?
The crust of our planet that is made of rock and soil is known as the:
a. hydrosphere b. ecosphere c. biosphere d. lithosphere e. atmosphere
Which of the following statements is NOT correct about cnidarians?
A. Most are found in shallow coastal marine environments. B. A jellylike mesoglea separates the two tissue layers. C. The adult body is bilaterally symmetrical. D. Stinging cells contain a threadlike nematocyst released to capture prey. E. There are two tissue layers, an outer epidermis, and inner gastrodermis.