The dragline that is laid by many spiders serves as a means of:
A. capturing prey.
B. capturing a mate.
C. detecting the pull of gravity.
D. communication.
E. holding the eggs of spiders
D
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Type II survivorship curves
a. are characteristic of humans and elephants. b. indicate a fairly constant rate of death at all ages. c. indicate a high mortality rate in the very young. d. are characteristic of species in which most individuals live a relatively long life and die of old age. e. are typical of species with high biotic potentials
One of the conclusions drawn from Darwin's theory of evolution is that:a
existing organisms can adapt to environmental changes. b. genetic information can pass from organism to organism by means of DNA. c. living organisms are composed of basic units called cells. d. organisms living today descended with modifications from previously existing forms. e. living organisms contain substances produced by cells.
Brain cortices are important for the execution of a particular task within a specific lobe (i.e. the primary motor cortex initiates movement within the frontal lobe). However, brain areas are necessary for integrating information from different lobes. Which brain area is most responsible for the organization of movement before it is initiated?
a. Premotor area b. Supplementary motor area c. Sensory association area d. Primary somatosensory cortex
Crown gall disease in plants comes from exposure to the soil bacterium Agrobacterium tumefaciens. How is it that the tumors characteristic of the disease can persist when the bacteria are no longer found in the plant?
What will be an ideal response?