bio biology
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each of the black spaces below before clicking
on it to display the answer.
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| a reflex does not involve | the brain
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| the major function of cell-mediated immunity is to | destroy cancer cells and virus-infected cells
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| steriod hormones | alter the activity of genes
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| during muscle contraction | actin and myosin filaments slide past eachother
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| mammals are unique among all vetebrates because they | have hair.
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| under the biological species concept, the main criterion for identifying a species is | reproductive isolation
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| in the early history of life on earth which is the correct evolutionary sequence | anaerobic bacteria, cyanobacteria, aerobic bacteria
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| a mycorrhiza is a | fungus plant relationship
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| which of the following sets of characteristics would be considered most primitive (i.e. earlist in evolution) | radial symmetry, sac like gut, no cephalization.
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| two populations of organisms that are able to reproduce together but produce sterile offspring are considered | seperate species like the horse and donkey.
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| which of the following pairs of organisms are most closely related in ancestry | bat and whale.
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| consider two species that are members of the same class therefore, they | are also members of the same phylum.
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| what is the difference between an antigen and a antibody? | antigen is a part of the envador, and antibody is produced by the immune system.
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| ___ tissues are sheetlike with one free surface | epithelial
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| a ___ connects epithelium to underlying connective tissue | basement membrane
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| most animals have glands derived from ___ tissue. | epithelial
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| the most abundant protein in the human body is ___, made fibroblasts. | collagen
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| ___ is mostly plasma. | blood
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| your body converts excess carbohydrates and proteins to fats, which accumulate in ___. | adipose tissue cells
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| ___ tissues are the body's most abundant and widely distributed tissue. | connective
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| cell of ___ can shorten (contract) | muscle tissue
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| ___ muscle tissue has a striated appearance | skeletal and cardiac
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| ___ detects and integrates information about changes and controls responses to those changes | nervous tissue
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| thin cytoplasmic protection from cells called ___ carry signals between your spinal cord and your toes. | nuerons
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| A hydrostatic skeleton consists of | a fluid in an enclosed space
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| bones are | mineral reservoirs, skeletal muscle's partners, and sites where blood cells form (some bones only).
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| the human backbone | consists of vertebrae and intervertebral cartilage disks, has a shape adapted to upright walking, and enclosed the spinal cord.
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